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01-02-2018
Physics

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A 18.0-kg rock is sliding on a rough, horizontal surface at 7.10 m/s and eventually stops due to friction. the coefficient of kinetic friction between the rock and the surface is 0.175. what average power is produced by friction as the rock stops?

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odadgumit odadgumit

01-02-2018

a = .3*g = 2.94 m/s²

t = v/a = 9/2.94 = 3.061 sec

W = E/t = ½mv²/t = ½*40*9²/3.061 = 529.2 watts

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