In which case of an orbiting satellite if the radius of orbit is decreased

Options

A. its kinetic energy decreases
B. its potentia energy increases
C. Both (a) and (b) are correct
D. Both (a) and (b) are wrong

Answer

D

Explanation

As kinetic energy, `K=(GMm)/(2r)`
Potentialm energy, `U=-(GMm)/(r)`
Total energy, `E=-(GMm)/(2r)`
If `r` is decreased, K will increase but U and E will decrease.