Respostas

2014-06-10T20:25:41-03:00
Epe = kx²/2

Epe = 40·(4·10⁻²)²/2
Epe = 20·16·10⁻⁴ = 320·10⁻⁴ 
Epe =0,032N ou  3,2·10⁻²N


2 2 2