Jawabanmu

2014-09-09T18:00:35+07:00
Dik: v = 15m/s
      x = 30 m
dit: h = ..?
jwb:
x = v x t
x = v x  \sqrt{ \frac{2h}{g} }
 \frac{x}{v} =  \sqrt{ \frac{2h}{g} }
 \frac{30}{15} =  \sqrt{ \frac{2h}{10} }
2 =  \sqrt{ \frac{2h}{10} } ... kuadratkan kedua ruas agar mudah menghitung
4 =  \frac{2h}{10}
2h = 4 x 10
2h = 40
h =  \frac{40}{2}
h = 20m

check ulang htunganny ya, semoga membantu:)