roseclemmings503 roseclemmings503

20-12-2022
Physics

Answered

A dockhand rolls a barrel up a plank 6.40 m long. the barrel weighs 425 n and is displaced a height of 1.28 m. the dockhand exerts a constant force of 95.0 n parallel to the plank. a. what work is needed to overcome friction? (64.0 j) b. what is the efficiency of the person?

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