SAT, 30.11.2021 01:50 raywils0n12300p0t3yc

A boy weighing 150 n goes (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 and b)?.

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A boy weighing 150 n goes (a) up and (b) down a flight of stairs. The vertical distance between the...

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