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Two balls are projected simultaneously with the same speed from the top of a tower, one vertically up wards and the other vertically downwards. If the first bll strikes the ground with speed `20 m//s` then speed of second ball when it strikes the ground is.

A

`10 m//s`

B

`20 m//s`

C

`40 m//s`

D

Data insufficient

Text Solution

Verified by Experts

The correct Answer is:
B

Ball A has the same speed u when its crosses the top end of the tower while going down which is the intital speed of B.
As both have same velocities, so their velocities are same upon reaching the ground.
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