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Karen has a mass of 53 kg as she rides the up escalator at woodley park station of the washington
d.
c. metro. karen rode a distance of 61.4 m, the longest escalator in the free world. the acceleration of gravity is 9.8 m/s 2 . how much work did the escalator do on karen if it has an inclination of 27.7 ? ? answer in units of j.

Respuesta :

  Vertical height of longest escalator in free world = 58.8 sin 32.4 = 31. 5 m
Karen's mass = 54.6 kg
Work done on Karen = mgh = 54.6(9.81)(31.5) = 1.69e4 J = 16.9 KJ ANS

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