Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : If the only force acting on the projectile is the force of gravity, the trajectory of projectile will be parabolic.

Reason R : During the flight vertical factor remain constant and horizontal factor provides downward acceleration at 9.8 m/s

In the light of the above statements, choose the correct answer from the options given below: 

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UGC NET Paper 2: Physcial Education 21 Nov 2021 Shift 2
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  1. Both A and R are true and R is the correct explanation of A
  2. Both A and R are true and R is NOT the correct explanation of A
  3. A is ture but R is false  
  4. A is false but R is true

Answer (Detailed Solution Below)

Option 3 : A is ture but R is false  
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UGC NET Paper 1: Held on 21st August 2024 Shift 1
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50 Questions 100 Marks 60 Mins

Detailed Solution

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Key Points

Assertion A : If the only force acting on the projectile is the force of gravity, the trajectory of projectile will be parabolic.

Explanation:

Projectile Motion:

  • A particle moves along a curved path under constant acceleration when thrown obliquely near the Earth's surface.
  • This curved path is always directed towards the centre of the Earth.
  • The path of such a particle is called the projectile's trajectory, and the motion is called projectile motion.
  • Projectile motion only occurs when there is one force applied at the beginning on the trajectory, after which the only interference is from gravity.

​Hence Assertion A is true.

Reason R : During the flight vertical factor remain constant and horizontal factor provides downward acceleration at 9.8 m/s

Explanation:

Projectile motion:

  • Projectiles travel with a parabolic trajectory due to the influence of gravity,
  • There are no horizontal forces acting upon projectiles and thus no horizontal acceleration,
  • The horizontal velocity of a projectile is constant (a never changing in value),
  • There is a vertical acceleration caused by gravity; its value is 9.8 m/s/s, down.
  • The vertical velocity of a projectile changes by 9.8 m/s each second.
  • The horizontal motion of a projectile is independent of its vertical motion.

Hence Reason R is false.

F6 Vinanti Teaching 22.02.23 D1

Therefore we can say that the correct answer is A is true but R is false  

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