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# Work

Work transfers energy to a system through the forceful manipulation of its state. Do some work on yourself to master this fundamental mode of energy transfer.

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 \(10\text{ m/s}^2.\)

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