What energy does an engine weighing 3 tons develop if it is lifted 10 km from the ground?

m = 3 t = 3000 kg.
h = 10 km = 10000 m.
g = 9.8 m / s ^ 2.
E -?
A body raised above the surface of the earth has potential energy En, which is determined by the formula: En = m
g * h.
Where m is the mass of the body, g is the acceleration of gravity, h is the height of the body above the ground.
Ep = 3000 kg * 9.8 m / s ^ 2 * 10000 m = 294,000,000 J = 294 MJ.
Answer: the engine will have a potential energy of Ep = 294,000,000 J = 294 MJ.