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Q.A retangle barge, 5m long and 2 meters wide, floats in freashwater. Suppose that its load is a 400-kg granite block. Show that the barge floats 4cm deeper.

Q. What is the kinetic energy of a 1,500 kg car with velocity of 72.0 km/hr? How much work must be done on the car to bring it to a complete stop?

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