Please help; Explain phenomena about collision and water.

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Please help; Explain phenomena about collision and water.
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About motion of collision and water in ball // why object show that ? I not sure about momentum and energy ,i would like more explain.
 
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On the 2nd bounce the water in the ball doesn't get a chance to "bounce" like it did the first time, so it comes crashing down after the ball is already in the air, keeping it from bouncing as high.
 
I explain from Pi = Pf or (m+M)u =(m+M)v, ? not sure