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A 4.0 kg mass starting at rest is dropped from a height of 120 m above...

A 4.0 kg mass starting at rest is dropped from a height of 120 m above the surface of the Earth.  As it falls it experiences an air resistance of 13 N.  Just before it strikes the ground, determine the change in potential energy ΔU, the work done by the air W, the final kinetic energy Kf, and its final speed vf.

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