Respostas

2014-07-17T20:53:25-03:00
M = 5kg = 20n  e conceito 0.3 
m= -20n - 5kg
m= -15 = 0.3 
m= 6.92 
{ 6.92 }
2014-07-18T00:41:42-03:00
FR = F - Fat
m.a = F - μ.N
m.a = F - μ.m.g
a = (F-μ.m.g)/m
a = (20-0,3.5.9,8)/5 = 1,06 m/ s^{2}