A satellite of mass 100kg revolves round the earth in a circular orbit of radius 2R where R is the radius of the earth.Determine the energy needed to move the satellite to a new orbit of radius 3R.
(Mass of earth=6.0x10^24kg;R=6.4x10^6m)

Question

A satellite of mass 100kg revolves round the earth in a circular orbit of radius 2R where R is the radius of the earth.Determine the energy needed to move the satellite to a new orbit of radius 3R.
(Mass of earth=6.0x10^24kg;R=6.4x10^6m)

fifciol · Answer

$$E=\Delta E_p=-\frac{ GMm }{ 3R}+\frac{ GMm }{ 2R}$$

jt950 · Answer

This is the answer
E=ΔEp=−GMm/(2)3R+GMm/(2)2R

can you explain?