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Q.

A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s. The height of the tower is  :( g=10 m/s2)

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a

340 m

b

320 m

c

300 m

d

360 m

answer is C.

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Detailed Solution

v2−u2=2as802−202=2×10×hh=100×6020=300m
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