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A ball is dropped from a bridge at a hei...

A ball is dropped from a bridge at a height of 176.4 m over a river. After 2s, a second ball is thrown straight downwards. What should be the initial velocity of the second ball so that both hit the water simultaneously?

A

2.45 m/s

B

49 m/s

C

14.5 m/s

D

24.5 m/s

Text Solution

Verified by Experts

The correct Answer is:
D
For the body:
`1/2"gt"^2 =176.4 " " or " " t=sqrt((176.4xx2)/9.8)` or t=6s
For second body : t=4s
`u(4)=1/2g(4)^2=176.4`
u=24.5m/s.
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