A body of mass m collides against a wall with | vedclass

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Question

(A) The initial momentum of the body is $p_i = mv$ (taking the direction towards the wall as positive).After the collision,the body rebounds with the

Vedclass · Accepted Answer

$2\, mv$

Vedclass · Answer

(A) The initial momentum of the body is $p_i = mv$ (taking the direction towards the wall as positive).After the collision,the body rebounds with the same speed $v$ in the opposite direction,so the final momentum is $p_f = -mv$.The change in momentum $\Delta p$ is defined as the final momentum minus the initial momentum:$\Delta p = p_f - p_i$$\Delta p = (-mv) - (mv) = -2\,mv$.Since the magnitude of the change in momentum is requested,we consider the absolute value: $|\Delta p| = 2\,mv$.

$A$ body of mass $m$ collides against a wall with a velocity $v$ and rebounds with the same speed. Its change of momentum is

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