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Concepts Of Physics MCQ Edition [Volume 1]
Exam
Concepts Of Physics MCQ Edition [Volume 1]
Subject
Physics
Chapter
Centre of Mass, Linear momentum, Collision

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Centre of Mass, Linear momentum, Collision

A body travelling towards a stationary finite body collides with...

A body travelling towards a stationary finite body collides with it. Which of the following outcomes are possible?

Options

  1. Aboth bodies come to rest
  2. Bboth bodies are in motion after the collision
  3. Cthe initially moving body comes to rest and the stationary body begins to move
  4. Dthe stationary body remains at rest while the moving body changes its velocity

Correct answer

C. the initially moving body comes to rest and the stationary body begins to move

Step-by-step solution

Let the mass of the moving body be m1m_1 with initial velocity u1≠0u_1 \neq 0.

Let the mass of the stationary finite body be m2m_2 with initial velocity u2=0u_2 = 0.

The initial momentum of the system is Pi=m1u1≠0P_i = m_1 u_1 \neq 0.

According to the law of conservation of linear momentum, the final momentum PfP_f must be equal to PiP_i.

If both bodies come to rest, Pf=0P_f = 0, which violates the conservation of momentum. Thus, the first outcome is not possible.

If the stationary body remains at rest, its change in momentum is zero, meaning no impulse acted on it. By Newton's third law, no impulse acted on the moving body either, so its velocity cannot change. Thus, the fourth outcome is not possible.

If the collision is perfectly elastic and m1=m2m_1 = m_2, the bodies exchange velocities. The moving body comes to rest and the stationary body moves with velocity u1u_1. Thus, the third outcome is possible.

For other mass ratios or inelastic collisions, both bodies can be in motion after the collision. Thus, the second outcome is possible.
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