A skier with a potential energy of 137,200 J waits on top of a ski jump that is 200 m high. What is the mass of the skier?

Gravitational potential energy is calculated with PE = mgh, where h is the height and g is about 9.8 m/s². Rearranging gives m = PE/(gh) = 137,200/(9.8 × 200) = 70 kg. The skier’s mass is 70 kg, choice B.

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