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A rubber ball is bounced on the floor of...

A rubber ball is bounced on the floor of a room which has its ceiling at a height of 3.2 m from the floor. The ball hits the floor with a speed of 10 m`//`s, and rebounds vertically up. If all collisions simply reverse the velocity of the ball, without changing its speed, then how long does it take the ball for a round trip, from the moment it bounces from the floor to the moment it returns back to it ? Acceleration due to gravity is 10 `m//s^2`

A

4 s

B

2 s

C

0.8 s

D

1.2 s

Text Solution

Verified by Experts

The correct Answer is:
C
`t=sqrt((2h)/g)=sqrt((2xx3.2)/(10))=0.8s`
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