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A ball of mass 12.2 g is dropped from rest at a height of 76 cm above the surface of oil that fills a barrel to a depth of 55 cm. The ball reaches the bottom of the barrel with a speed of 1.48 m/s. (a) Neglecting air resistance, find the speed of the ball when it enters the oil. (ball when it enters the oil. (b) What is the change in the internal energy of the system of ball + oil?
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