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## Homework Statement

A student has six books, all of them with a 4cm thickness and a weight of 30N. ¿What would be the minimum work to put the books in one pile, if the six books are in a table?

Weight: 30N

Thickness: 4cm.

Gravity: 9.81ms

^{-2}

## Homework Equations

E

_{p}=mgh

E

_{c}=(mv

^{2})/2

## The Attempt at a Solution

I found the mass of each book, which is 3.06kg, and converted the thickness to m, 0.04m.

After that, i'm lost. :S I don't know how to work it out..