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A ball is dropped from the top of a buil...

A ball is dropped from the top of a building the ball takes 0.5 s to fall past the 3 m length of a window at certain distance from the top of the building. Speed of the ball as it crosses the top edge of the window is `(g=10 m//s^(2))`

A

3.5 `ms^(-1)`

B

8.5 `ms^(-1)`

C

5 `ms^(-1)`

D

12 `ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`S = ut + (1)/(2)at^(2) rArr 3 = (v xx 0.5) + (1)/(2) xx 10 xx (0.5)^(2)`
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