On the planet Zorag, Angel drops a 5 Kg rock from a space shuttle hovering 10 meters high. The rock does 300 N*M of work on the way down. What is the acceleration due to gravity on planet Zorag?

The work done in bringing the rock from the ship to the ground is the potential energy it has before Angel drops it.         Potential energy = (mass) x (gravity) x (height)You have said that this amounts to  300 N-m .                                       300 N-m    = (5 kg) x (gravity) x (10 m)Divide each side by  10m :      30 N = (5 kg) x (gravity)Divide each side by  5 kg :    6 N/kg = 6 m/s² = gravity=============================By the way ...  The rock doesn't do the work on the way down. Gravity does it !