Question

b) The height of the body moves away from the surface of the earth.​

Answer 1

Answer:

From work-energy theorem, work done = change in potential energy.

Work done = ∫

R

3R

x

2

GmM

dx=

3R

2GmM

=

3

2mgR

.

Please note that the gravitational force will necessarily vary over this height because it is comparable with earth's radius.