A 75.0-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 4.30 m. What is the work done on the man by (a) the gravitational force and (b) the escalator?

Answer 1

1. W(grav) = -mgh
2. W(es) = mgh

Answer 2

a)80
b) 97

Answer 3

previous answers were wrong