Alien playing ping pong?
An alien is playing ping pong in 0 gravity. The alien is 12m from a flat wall and floating toward it 4 m/s. The ping pong ball bounces back and forth between his paddle and the wall at 11 m/s. (the balls hitting the paddle are "elastic")The alien hits the ball with the paddle. What distance does the ball have to travel during this process in m? How long does the alien have to wait to reach the wall in s? Divide the how long the ball travels with the distance the alien has to travel.
The answer is 11.
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