Odpowiedzi

2010-02-27T12:29:05+01:00
Vo=20m/s
h=15m
v=? m/s

Ep=½mv²₀
Ek=½mv² + mgh
Ep=Ek
½mv²₀=½mv² + mgh /:m
½v²₀=½v² + gh /*2
v²₀=v²+2gh / - 2gh
v²₀ - 2gh=v²
√v²₀ - 2gh = v
√400m²/s²-2*10m/s²*15m =v
√400m²/s²-300m²/s² = v
√100m²/s²= v
10 m/s = v