If M be the mass of the earth, R its rad...

If M be the mass of the earth, R its radius (assumed spherical) and G gravitational constant, then the amount of work that must be done on a body of mass m, so that it completely escapes from the gravity of the earth of the earth is given by

A

`(GmM)/(R)`

B

`(GmM)/(2R)`

C

`(3GmM)/(2R)`

D

`(4GmM)/(3R)`

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The correct Answer is:

A

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