Jawabanmu

2014-02-12T21:22:19+07:00
F1/A1 = F2/A2
Jika F=W=m.g=(4kg)(10m/s2)=40
maka:
40/5A2=F2/A2
(40/5A2)(A2)=F2
8=F2
F2=m2.g
8=m2.10
m2=8/10