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Q.

A ball of mass 400 gm is dropped from a height of 5m. A boy on the ground hits the ball vertically upwards with a bat with an average force of 100N so that it attains a vertical height of 20m. Find the time for which the ball remains in contact with the bat

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a

0.12s

b

0.24s

c

0.36s

d

0.48s

answer is A.

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