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 100 newton so that it attains a vertical height of 20 m. The time for which the ball remains in contact with the bat is 
Text Solution
Verified by ExpertsThe correct answer is:
A
Velocity by which the ball hits the bat
or 
velocity of rebound
or 
by solving 
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