First slide

Gravitaional potential energy

Question

The amount of work done in lifting a body of mass ‘m’ from the surface of the earth to a height equal to twice the radius of the earth is

Easy

A

$\large \frac {2GMm}{3R}$
B

$\large \frac {3GMm}{2R}$
C

$\large \frac {5GMm}{3R}$
D

$\large \frac {3GMm}{5R}$

Solution

$\large U_i=-\frac {GMm}{R};U_f=-\frac {GMm}{3R}$
W = ΔU = U_f - U_i

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