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  4. A ball of mass m strikes a rigid wall with speed u and rebounds with the same speed. The impulse imparted to the ball by the wall is

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Q. A ball of mass $m$ strikes a rigid wall with speed $u$ and rebounds with the same speed. The impulse imparted to the ball by the wall is

Laws of Motion

Solution:

The situation is as shown in the figure.image
$p_{initial}=mu,$ $p_{final}=-mu$
Impulse imparted to the ball = Change in momentum
$=p_{final} -p_{initial}$ $=-mu-mu$ $=-2 mu$