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A 10.0 kg box is pushed from the top of an incline and travels down the incline with an initial speed of 5.00 m/s.  The incline is 4.00 m long and the angle of the incline is 37.0 degrees.  The coefficient of friction between the box and the incline is 0.400.  Determine the a) loss of potential energy and b) work done by friction.  c) Use the work-energy theorem to determine the velocity of the box at the bottom of the incline.