A ball hits a vertical wall horizontally at $10m/s$ bounces back at $10 m/s$
A ball hits a vertical wall horizontally at $10m/s$ bounces back at $10 m/s$
- A
There is no acceleration because $10\,\frac{m}{s} - \,10\frac{m}{s} = 0$
- B
There may be an acceleration because its initial direction is horizontal
- C
There is an acceleration because there is a momentum change
- D
Even though there is no change in momentum there is a change in direction. Hence it has an acceleration
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