Question

a body of mass M collides against a wall with velocity v and rebounds with the same speed its change in momentum is​

Answer 1

Answer:2mv

Explanation:because when the ball but the wall the momentum is mv

And when after hitting it rebounds back that implies the momentum here is mv ( in magnitude) but it is in opposite direction that means momentum is -mv.

Then the change in momentum is P1-P2= mv -(-mv)= 2mv

Answer 2

change in momentum is -2Mv

Explanation:

• given body have mass= M and velocity= v

          Initial momentum = mass of body × velocity of body

                                        = M × v

                                        = Mv

    After collision as body rebounds so the final velocity will have same magnitude and opposite direction of initial velocity

     so final velocity of the body= -v

•    Final momentum of the body= mass of body × velocity of body

                                                            = M × (-v)

                                                            = -Mv

        Change in momentum = final momentum - initial momentum

                                               = -M v -M v

                                               = -2Mv

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