Explanation

(d) Kinetic energy of the satellite is $K = \frac{GMm}{2r}$ …(i)
Potential energy of the satellite is $U = - \frac{GMm}{r}$ …(ii)
Total energy of the satellite is $E = - \frac{GMm}{2r}$ …(iii)
Divide (iii) by (i), we get $\frac{E}{K} = - 1$ or $E = - K$
Divide (iii) by (ii), we get $\frac{E}{U} = \frac{1}{2}$ or $E = \frac{U}{2}$