Question

A 2.0 kg book is lying on a 0.78 m -high table. You pick it up and place it on a bookshelf 2.1 m above the floor.Part ADuring this process, how much work does gravity do on the book?

Answer 1

ANSWER:

25.87 J

STEP-BY-STEP EXPLANATION:

The work due to gravity in this case would be the weight times the height difference, therefore:

$W=m\cdot g\cdot\Delta h$

We replace and calculate the work like this:

$\begin{gathered} W=2\cdot9.8\cdot(2.1-0.78) \\ W=25.87\text{ J} \end{gathered}$

The work due to gravity is 25.87 J