A tennis ball hits a vertical wall horizontally at 20 m/s bounces back at 20 m/s

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A tennis ball hits a vertical wall horizontally at 20 m/s bounces back at 20 m/s

1. There is no acceleration because 2. There may be an acceleration because its initial direction is horizontal3. There is an acceleration because there is a momentum change4. Even though there is no change in momentum there is a change in direction. Hence it has an acceleration

A tennis ball hits a vertical wall horizontally at 20 m/s bounces back at 20 m/s