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A block with a mass of 18.5kg is pulled up a smooth incline that makes an angle of 27.5° with respect to the horizontal at a constant speed by an electric motor. If the power output of the motor is 75.0W, how long in seconds will it take for the block to be pulled 20.0m along the incline? Assume that the motor pulls the block with a force parallel to the incline.
Sagot :
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