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A man throws ball with the same speed ve...

A man throws ball with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two ball are in the sky at any time (Given `g=10(m)/(2^2)`)

A

At least 0.8 m/s

B

Any speed less than 19.6 m/s

C

Only with speed 19.6 m/s

D

More than 19.6 m/s

Text Solution

Verified by Experts

The correct Answer is:
D
Let minimum three balls remain in air, then Time of flight (T) > 4sec
`rArr (2u)/(g) gt 4 rArr u gt (4 xx 9.8)/(2)`
`rArr u gt 19.6m//s`
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