Respostas

2014-01-21T12:25:52-02:00
Tfr = ΔEc

Trf = m.vf² / 2  - m.vo² / 2

m = massa
v = velocidade

Tfr = 10.8² / 2 - 10 .6² / 2

Tfr = 640 - 360 / 2 ~>140 J