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A body is released from a height equal t...

A body is released from a height equal to the radius (R)of the earth.The velocity of the body when it strikes the surface of the earth will be:
(Given g = acceleration due to gravity on the earth)

A

`sqrt(gR)`

B

`sqrt(2gR)`

C

`sqrt(4gR)`

D

`sqrt((gR)/2)`

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