$A$ ball hits a vertical wall horizontally at $10 \ m/s$ and bounces back at $10 \ m/s$. Which of the following statements is correct?
- AThere is no acceleration because $10 \ m/s - 10 \ m/s = 0$.
- BThere may be an acceleration because its initial direction is horizontal.
- CThere is an acceleration because there is a momentum change.
- DEven though there is no change in momentum,there is a change in direction. Hence it has an acceleration.
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