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A ball is thrown straight up. What is it...

A ball is thrown straight up. What is its velocity and acceleration at the top?

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At the highest point , the velocity is zero and acceleration is `9.8ms^(-2)` acting in downward direction .
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MODERN PUBLICATION-MOTION IN A PLANE -Revision Exercises (very Short Answer Questions)
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  10. What is centriprtal acceleration ? In which direction it acts ?

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