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A motor running on electricity at the rate of 400 W raises a block of weight 120 N. If the block moves 8 m vertically in 4 s, the efficiency of the motor is

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Physics MCQ: A motor running on electricity at the rate of 400 W raises a block of weight 120 N. If the block moves 8 m vertically in 4 s, the efficiency of the motor is | Extra Education