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An object is projected in upward directi...

An object is projected in upward direction with speed `sqrt((gR)/6)` from height h= 2R above the surface of earth. The speed with which the object will collide the earth surface. (Neglect the air drag, R us the radius of the earth and M is mass of earth

A

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

B

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

C

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

D

`sqrt((6GM)/(7R))`

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