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An object is propelled vertically to a m...

An object is propelled vertically to a maximum height of 4R from the surface of a planet of radius R and mass M. The speed of object when it returns to the surface of the planet is -

A

`2 sqrt((2GM)/(5R))`

B

`sqrt((GM)/(2R))`

C

`sqrt((3GM)/(2R))`

D

`sqrt((GM)/(5R))`

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The correct Answer is:
A
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