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A tennis ball hits a wall and bounces back. Does the momentum of the ball change?...

A tennis ball hits a wall and bounces back. Does the momentum of the ball

change? If yes, why is it not conserved? If no, why not?

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Answer #1

The tennis ball.

Momentum equals mass x velociy (and it's a vector, meaning it has direction)

The tennis ball will bounce off and have an opposite velocity and momentum.

change in momentum equals twice its original momentum.

Original momentum of ball: +mv

Final momentum of ball: -mv

Change in momentum of ball: -2mv

Momentum is conserved when there is no external force acting on the system. In this case, the momentum of the ball is not conserved because it is acted on by a force from the wall.


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