Jawabanmu

2014-06-10T15:42:05+07:00
F=1/10
f=0,1 cm = 10 mm
20 cm = 200 mm

1/s=1/10 - 1/200
1/s=20/200 - 1/200
1/s=19/200
s=10,526 mm
s=1,052 cm
sekian.