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A small body of mass m falls to the eart...

A small body of mass m falls to the earth from infintie distance away. What will be its velocity or reaching the earth? (Radius of the earth = R, acceleration due to gravity on the surface of the earth is g) :-

A

`gR`

B

2gR

C

`sqrt(gR)`

D

`sqrt(2gR)`

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The correct Answer is:
D
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