Question

A people-moving conveyor-belt moves a 600-newton person a distance of 100 meters through the airport.

Answer 1

In a), no work is done to move horizontally 'across" gravity. In b), he does (m) (g) (h) = (100)(9.8)(1) = 980 joules of work to lift the bag, and then no more work is done by the belt to move both of them horizontally.