A ball is dropped on the floor from a height of 10 m . It rebounds to a height of 2.5 m . If the ball is in contact with the floor for 0.01 sec , the average acceleration during contact is
A
2100 
downwards
downwards
B
2100 
upwards
upwards
C
1400 
D
700 
Text Solution
Verified by ExpertsThe correct answer is:
B
Velocity at the time of striking the floor,
Velocity with which it rebounds.
Change in velocity 
Acceleration 
(upwards)
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