Answer to Question #151696 in Mechanics | Relativity for Romeo

Question

An elevator of mass m is initially at rest on the first floor of a building. It moves upward, and passes the second and third floors with a constant velocity, and finally stops at the fourth floor. The distance between adjacent

floors is h. What is the net work done on the elevator during the entire trip, from the first floor to the fourth floor?

Answer 1

The lift moves three floors, Thus distance n=3

The elevator moves upward, the elevator's energy increases so work done on space it is positive.