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Two tall buildings are 30 m apart. The s...

Two tall buildings are `30 m` apart. The speed with which a ball must be thrown horizontally from a window `150 m` above the ground in one building so that it enters a window `27.5 m` from the ground in the other building is.

A

`2ms^(-1)`

B

`6ms^(-1)`

C

`4ms^(-1)`

D

`8ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
b
`h=150-27.5=122.5m`
`t=sqrt((2xx122.5)/9.8)=5sec`
Hence `u=R/t=30/5=6ms^(-1)`
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