A skier at the top of a hill has 4000 joules of potential energy and no kinetic energy. Ignoring friction, how much kinetic energy will she have at the bottom, where potential energy is zero?
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Correct answer to question 121 (Mechanical Comprehension): 4000 joules
Method
By conservation of energy, all the potential energy converts to kinetic energy when friction and air resistance are ignored.
Updated: November 2026
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