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A 11600 kg railroad car is coasting on a level, frictionless track at a speed of...

A 11600 kg railroad car is coasting on a level, frictionless track at a speed of 16.0 m/s when a 5420 kg load is dropped onto it. If the load is initially at rest, find the a) new speed of the car and b) % change of the kinetic energy.

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