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A painter uses 1.93 kj of mechanical energy to lift a 20 kg paint barrel to a height of 7.5 m above the ground. a.

A painter uses 1.93 kj of mechanical energy to lift a 20 kg paint barrel to a height of 7.5 m above the ground.

a. how much work was done lifting the paint barrel?

b. how much energy does the paint barrel actually possess at the top?

c. what is the efficiency of the ropeand-pulley system?

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