Jawabanmu

2013-12-08T17:21:50+07:00
W = F*s*cos  \alpha
= 50*20*cos 60
=500 J
1 3 1
2013-12-08T21:04:35+07:00
Dik : F = 50 N
       sudut = 60
       s = 20 m
dit : W ?
jawab :
W = F.cos alfa . s
     = 50. cos 60. 20
     = 500 J