If a heavier and a lighter body have the same kinetic energy and they are stopped by applying the same force, which one will stop first?

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Solution

Energy equals force times distance. Therefore, the two bodies will be brought to rest after traversing equal distances. Since the lighter body must initially be moving faster than the heavier in order for their kinetic energies to be equal, it will traverse that distance faster than the heavier. Therefore, it will stop first.

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