A 86.0 kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity?

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A 86.0 kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity?

from ground level to the floor above, a vertical height of 4.50 m. What is the work done on the man by (a) the gravitational force and (b) the escalator?

2006-10-26 08:21:05 · 2 answers · asked by meggers 3 in Science & Mathematics ➔ Physics

2 answers

a) work done by gravitational force = -mgh = 86*9.8*4.5m
W = - 3792.6J
b) Work done by escalator = +3792.6J

2006-10-26 08:34:22 · answer #1 · answered by quark_sa 2 · 2⤊ 0⤋

the work done is the change in potential energy

2006-10-26 15:23:26 · answer #2 · answered by arbiter007 6 · 3⤊ 0⤋