a mechanic uses a chain and bloc pulley to lift a 875-kg engine 4.0 m to the top of the garage. the downward force on the chain over the 4.0 m distance is 5.0 x 10^4 N.

a)calculate the work done in raseing the motor
b)how much useful work was done
c)what is the inefficiency of the chain and block pulley in raising the motor

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