Respostas

2014-04-28T13:13:34-03:00
 \frac{F1}{A1} = \frac{F2}{A2}

F - > FORÇA PESO = massa . g

g ~> 10m /s²


 \frac{4.(10)}{80}  =  \frac{X . (10)}{20}

x = 1 kg