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A ball moving at 30 m/s towards south is...

A ball moving at 30 m/s towards south is hit by a cricketer by his bat. As a result, the ball moves towards north at 20 m/s. What is the change in velocity ? If the collision lasts for 0.02s , what is the acceleration?

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The correct Answer is:
50 m/s towards north; 2500 m/`s^(2)`
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