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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

a) At least 0.8 `m//s`

B

(b) Any speed less than 19.6 `m//s `

C

(c) Only with speed 19.6 `m//s `

D

(d) More than 19.6 `m//s`

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