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15-91. If the rod of negligible mass is subjected to a couple moment of M = (30t²) N·m and the engine of the car supplies a traction force of F = (15t) N to the wheels,where t is in seconds, determine the speed of the car at the instant t = 5 s. The car starts from rest. The total mass of the car and rider is 150 kg. Neglect the size of the car.

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