Classical Mechanics
# Work

What is the minimum amount of work **in Joules** that a 60 kg man must do in order to climb up a tree house that is 3 meters high?

**Details and assumptions**

- The acceleration of gravity is $-9.8\text{ m/s}^2.$

A man who is standing on a ladder vertically lifts a book of mass $3\text{ kg}$ with a rope at a constant speed. If the change in the book's height is $7\text{ m},$ how much work did the man do on the book?

The gravitational acceleration is $10\text{ m/s}^2.$