Jawabanmu

2013-12-14T11:50:59+07:00
M = 1 kg
h = 80 m
g = 10 m/s^{2}  

Vt^{2}  = Vo^{2} + 2gh
Vt^{2} = 0^{2}  + 2.10.80
Vt^{2} = 1600
Vt =  \sqrt{1600}
Vt = 40 m/s^{2}