Work, Energy and Power

Question: A ball hits a vertical wall horizontally at 10m/s bounces back at 10 m/s



1) There is no acceleration because $10\,\frac{m}{s} - \,10\frac{m}{s} = 0$
2) There may be an acceleration because its initial direction is horizontal
3) There is an acceleration because there is a momentum change
4) Even though there is no change in momentum there is a change in direction. Hence it has an acceleration
Solution: Explanation: No Explanation
WEP Elastic and Inelastic collision

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