feedback: It appears that there may be a sign error associated with at least one term in your expression. Your answer is very close unfortunately there are additional terms in your equation that are not necessary.
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E= KE + PE
E = (1/2)mC^(2) + mgz
Power = E/t
Total energy=Potential energy+Kinetic energy E Total = [1/2(mv2)] -(GMm/r)