Jawabanmu

2014-09-01T14:59:41+07:00
Dik : m= 2 kg
h= 20m
t=,,,?

h=1/2.g.t
20 = 1/2 .10.t^2
20= 5t
t^2= 20/5
t = /4 = 2 s

ps: t^2 = t pangkat 2
/4 = akar 4
1 4 1