Respostas

2014-08-21T09:21:37-03:00
Ec= mv^2/2
Ec= 8*20^2/2 =1600J
1 1 1
2014-08-21T10:39:14-03:00
Ec = m.v² / 2
dados :

Ec = ?
m = 8
v = 20
resolução

Ec = 8.20² / 2
Ec = 8 . 400 / 2
Ec = 3200 / 2
Ec = 1600 Joules