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A 2.5 hp (1 hp = 744 W) motor is used to power a hoist...

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A 2.5 hp (1 hp = 744 W) motor is used to power a hoist to lift a 1700 kg car 1.86 m above the garage floor.a)How much time does it take the hoist to lift the car?b)The hoist slowly lowers the car back down to the ground. How much work does the hoist motor do in lowering the car?

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