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**1. Homework Statement**

A 1.7 kg book is lying on a 0.99-m-high table. You pick it up and place it on a bookshelf 2.43 m above the floor.

How much work does gravity do on the book

**2. Homework Equations**

Wmg=mgYi-mgYf

**3. The Attempt at a Solution**

I thought that is the correct equation so I simply just plugged and chugged but it came out wrong. What did I do wrong?