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A ball is thrown upward with speed 10 m/...

A ball is thrown upward with speed 10 m/s from the top to the tower reaches the ground with a speed 20 m/s. The height of the tower is [Take `g=10m//s^(2)`]

A

10 m

B

15 m

C

20 m

D

25 m

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The correct Answer is:
B
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