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A stone is thrown vertically up at 20 m/...

A stone is thrown vertically up at 20 m/s from a tower 80 m height. The speed with which it hits the ground is `[g=10 "m/s"^2]`

A

14.4 m/s

B

28.14 m/s

C

80 m/s

D

`sqrt5` 20 m/s

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The correct Answer is:
D
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