f) During a game of squash a player hits the ball toward the wall with a speed o

Question

f) During a game of squash a player hits the ball toward the wall with a speed of 15.0 m/s. The ball bounces back horizontally with the same speed (see figure to the right). As a result of the bounce, the... Circle ALL that apply 15 m/s A) .momentum of the ball does not change B) ...wall-earth system gains momentum from the ball C) the ball gains momentum in the negative x-direction D) ..the magnitude of the ball's change in momentum is twice as 15 m/s large as the magnitude of its initial momentum E) ..momentum of the ball-wall-earth system does not change Page 5 of 12

Explanation / Answer

Here Initial momentum of ball is in positive direction and final momentum in negative direction so change in momentum of ball is negative.

There is no external force on wall-earth + ball system , so total momentum of wall-earth + ball system will be conserved . If ball I getting momentum in negative direction then wall-earth system will get momentum in positive direction.

Change in momentum of ball = Pfinal - Pinitial

= -15m - (15m) = -30m, here m is mass of ball

Initial momentum of ball = 15m

So magnitude of change in momentum Is twice of initial momentum.

Momentum of the whole system (ball-wall-earth) will be conserved.

So correct answer are (B) , (C) , (D) and (E)

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