English
Hindi
Telugu
Bengali
Marathi
Malayalam
Tamil

Question

Download Solution PDF

The law of conservation of momentum is applicable for

  1. only two particles
  2. individual particles only
  3. a system of particles
  4. more than three particles only

Answer (Detailed Solution Below)

Option 3 : a system of particles
Free Tests
View all Free tests >
Free
General Knowledge for All Defence Exams (शूरवीर): Special Live Test
20 Qs. 20 Marks 16 Mins
Start Now

Detailed Solution

Download Solution PDF

The correct answer is option 3) i.e. a system of particles

CONCEPT:

  • Momentum: Momentum is the impact due to a moving object of mass m and velocity v.

The momentum (p) of an object is expressed as:

p = mv

  • Law of conservation of momentum: Momentum is conserved for any interaction between objects in an isolated system.
    • ​The conservation of momentum can be observed by analyzing the momentum of the total system or by analyzing the change in momentum.
    • This is done by equating the momentum before the interaction to the momentum after the interaction.

​EXPLANATION:

  • According to the law of conservation of momentum, the total momentum of a system is conserved.
  • This means that the net momentum due to each of the particles present in a system is conserved.

Thus, the law of conservation of momentum holds true for a system of particles.

Download Solution PDF
Latest Airforce Group X Updates

Last updated on Jul 11, 2025

->Indian Airforce Agniveer (02/2026) Online Form Link has been activated at the official portal. Interested candidates can apply between 11th July to 31st July 2025.

->The Examination will be held 25th September 2025 onwards.

-> Earlier, Indian Airforce Agniveer Group X 2025 Last date had been extended.

-> Candidates applied online from 7th to 2nd February 2025.

-> The online examination was conducted from 22nd March 2025 onwards.

-> The selection of the candidates will depend on three stages which are Phase 1 (Online Written Test), Phase 2 ( DV, Physical Fitness Test, Adaptability Test), and Phase 3 (Medical Examination).

-> The candidates who will qualify all the stages of selection process will be selected for the Air Force Group X posts & will receive a salary ranging of Rs. 30,000.

-> This is one of the most sought jobs. Candidates can also check the Airforce Group X Eligibility here.

Exams Tests Super Practice

More Conservation of Linear Momentum Questions

Q1.A bullet of mass 20 g is fired from a gun of mass 1 kg. If the recoil velocity of gun is 5 m/s, the velocity of bullet is:
Q2.A bullet of mass 25 g is fired horizontally with a velocity of 120 m/s from a pistol of 2·5 kg. The recoil velocity of the pistol is
Q3.A uniform square plate has a small piece Q of an irregular shape removed and glued to the centre of the plate leaving a hole behind (Fig. 7.3). The moment of inertia about the z-axis is then
Q4.A cricket ball of mass 150 g has an initial velocity u = \((3\widehat i+4\widehat j)\)m s−1 and a final velocity v = \(-(3\widehat i+4\widehat j)\)m s−1 after being hit. The magnitude of the momentum transferred during the hit is
Q5.A cricket ball of mass 150 g has an initial velocity u = \((3\widehat i+4\widehat j)\)m s−1 and a final velocity v = \(-(3\widehat i+4\widehat j)\)m s−1 after being hit. The change in momentum (final momentum-initial momentum) is (in kg m s1)
Q6.A bullet of mass 10 g is horizontally fired with velocity 300 m s-1 from a pistol of mass 1 kg. What is the recoil velocity of the pistol?
Q7.A particle of mass 5 m at rest suddenly breaks on its own into three fragments. Two fragments of mass m each move along a mutually perpendicular direction with speed v each. The energy released during the process is,
Q8.An object flying in air with velocity (\(20\hat{i}+25\hat{j}−12\hat{k}\)) suddenly breaks into two pieces whose masses are in the ratio 1 ∶ 5. The smaller mass flies off with a velocity (\(100\hat{i} + 35\hat{j} + 8\hat{k}\)). The velocity of the larger piece will be, 
Q9.A man wearing a bullet-proof vest stands on roller skates. The total mass is 80 kg. A bullet of mass 20 g is fired at 400 m/s. It is stopped by the vest and falls to the ground. Then what is the velocity of the man?
Q10.A shell of mass m is at rest initially. It explodes into three fragments having mass in the ratio  2 ∶ 2 ∶ 1. If the fragments having equal mass fly off along mutually perpendicular directions with speed v, the speed of the third (lighter) fragment is:

More Center of Mass and Linear Momentum Questions

Q1.For which of the following does the centre of mass lie outside the body?
Q2.In a closed system of two interacting particles, m1 and m2, the center of mass is stationary. Given the trajectory of m1 and that m2 = m1, determine the trajectory of m2.
Q3.A ball of 8 kg, moving at 15 m/s, enters a 22 kg spring gun at rest. If the surfaces are frictionless and the spring is massless, determine the gun's speed after the ball stops moving relative to the gun.
Q4.A square frame is constructed from four uniform rods. The rods, AB, BC, CD, and DA, have masses 2m, 3m, 4m, and 5m respectively, and each has a length of 2a.  Where is the center of mass of this frame located in the x-y plane, specifically, which quadrant or region defined by x and y coordinates.
Q5.A bullet of mass 'a' and velocity 'b' is fired into a large block of wood of mass 'c'. The bullet gets embedded into the block of wood. The final velocity of the system is
Q6.A block A of mass 4 kg is placed on another block B of mass 5 kg, and the block B rests on a smooth horizontal table. If the minimum force that can be applied on A so that both the blocks move together is 12 N, the maximum force that can be applied to B for the blocks to move together will be
Q7.Two solid rubber balls A and B having masses 200 & 400 gm respectively are moving in opposite direction with velocity of A equal to 0.3 m/sec. After collision the two balls come to rest when the velocity of B is
Q8.Three point particles of mass 1 kg, 1.5 kg and 2.5 kg are placed at three corners of a right triangle of sides 4.0 cm, 3.0 cm and 5.0 cm as shown in the figure. The centre of mass of the system is at the point:
Q9.A circular hole of radius (a/2) is cut out of a circular disc of radius ‘a’ shown in figure. The centroid of the remaining circular portion with respect to point ‘O’ will be:
Q10.Three identical particles A, B and C of mass 100 kg each are placed in a straight line with AB = BC = 13 m. The gravitational force on a fourth particle P of the same mass is F, when placed at a distance 13 m from the particle B on the perpendicular bisector of the line AC. The value of F will be approximately
Suggested Test Series
View All >
Agniveer Vayu Group (X & XY) 02/2026 Mock Test Series
274 Total Tests with 3 Free Tests
Start Free Test
General Knowledge for All Defence Exams
317 Total Tests with   1 Free Tests
Start Free Test

Airforce Group X Important Links

ResultEligibility CriteriaSalary and Job ProfileAdmit CardSyllabus and Exam PatternAnswer Key

More Physics Questions

Q1.What is the region around a magnet where the magnetic force is experienced known as?
Q2.What is the angle that is formed between the incident ray and the normal line called?
Q3.If the force acting on the body is zero, then its momentum is -
Q4.A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound gets reflected from a water surface, the wavelength of the reflected sound will be _______. (Speed of sound in air is 340 ms-1)
Q5.What is the SI unit of current?
Q6.Torque acting on electric dipole moment \(\overrightarrow{P}\) placed in uniform electric field \(\overrightarrow{E}\) is 
Q7.Demodulation is essential feature of a
Q8. If the particles are moving with same velocity, then maximum de-Broglie wavelength is for
Q9.Image formed by an objective of a compound microscope is
Q10.Which of the following has smallest wavelength
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
support@testbook.com
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Hot Links： teen patti yas teen patti palace teen patti master 2023 dhani teen patti