Jawabanmu

2014-05-09T14:55:58+07:00
2014-05-09T15:27:36+07:00
V = λ/T
∧ =  120/2,5 = 48
T = 25/2,5 = 10
v = 48/10 = 4,8 cm/s = 0,048 m/s <--