Jawabanmu

2014-04-28T12:37:49+07:00
2014-04-28T12:39:50+07:00
F = m.g
f = 50 . 10 = 500N
jawab
F = w 
s     h
w = F . h : s
= 500 N . 2m : 4m = 500 N . 2 :4
= 1000 N : 4
= 250 N