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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

`2 m s^-1`

B

`6 m s^-1`

C

`4 m s^-1`

D

`8 m s^-1`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) `h = 150 - 27.5 = 122.5 m`
Time taken, `T = sqrt((2 h)/(g)) = sqrt((2 xx 122.5)/(9.8)) = 5 s`
Now `s = uT` or `30 = 5u` or `u = 6 ms^-1`.
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