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Find the gravitational potential energy of the stone.
A stone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. The stone rolls down 10 meters and comes to rest
on a patch of moss. The gravitational potential energy of the stone on the moss is
joules. (Use PE = mxgx h, where g = 9.8 N/kg.)