A roller coaster train with a mass of 500 kg stops at the top of a hill. If the hill is 110 m high, what is the potential energy of the train?

Gravitational potential energy is calculated with PE = mgh, where m is mass, g is gravitational acceleration, and h is height. Substituting the values gives PE = 500 × 9.8 × 110 = 539,000 J. Therefore, the train’s potential energy is 539,000 J, choice D.

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