Question

A boy weighing 150 N runs (a) up and (b) down a flight of stairs. The vertical distance between the floors is 5.5 m. How much work is done by gravity?

a. When the boy runs up, his displacement and pull of gravity are oppositely directed. The angle between force and displacement is 180°. The work done by gravity is
W= Fd cos180°

Answer 1

Answer:

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Explanation:

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