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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

340 m

B

230 m

C

300 m

D

360 m

Text Solution

Verified by Experts

The correct Answer is:
C

`v^(2) =u^(2)+2"gh"`
`80^(2)= 20^(2)+2 xx 10h`
h = 300 m
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