Jawabanmu

2014-04-20T11:53:08+07:00
Maaf kalo salah
a) s?
diket = s' =15 m
       =  f =-20 m
1/s= 1/-20 -1/15
1/s = -7/60
s = 60/-7
=8,571 m
b) m = s'/s
15/8,571