Jawabanmu

2014-06-02T16:56:10+07:00
Fa = Wu-Wa
Fa = 80 N - 60 N
Fa = 20 N

Fa = p air . g . Vair
Vair = Fa/ p air . g
Vair = 20 N/ 1000 kg/m3. 10
Vair = 0,002 m3