I tried it, but I am not getting no of the given answers
According to the statement, it is saying that
3 KE (in the orbit ) = ΔUg
So, beeing R the radius of the earth and R2 the radius of the orbit:
3 (1/2)(GMm/r2) = -GMm/r2 - (-GMm/R)
Canceling out the GMm:
(3/2)(1/r2)= (-1/r2) + (1/R)...