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A ball is thrown vertically downward wit...

A ball is thrown vertically downward with a velocity of 20m/s from the top of a tower,It hits the ground after some time with a velocity of 80m/s .The height of the tower is : `(g=10m/g^(2))`

A

360 m

B

340m

C

320m

D

300m

Text Solution

Verified by Experts

The correct Answer is:
D

`v^2 = u^2 + 2gh`
` h = (v^2 - u^2)/(2g) = (6400 - 400)/(20) = 300m`
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