Odpowiedzi

2010-03-25T17:47:57+01:00
Ep=Ek
mgh=mv²/2
gh=v²/2
v=√2gh
v=√20×3000≈77,5m/s
2010-03-25T17:58:36+01:00
H = 3km = 3000m
m = 60kg
V = ?
g = 10m/s²

h = gt²/2 /*2
2h = gt² /:g
2h/g = t² /√
t = √2h/g
t = √2*3000m / 10m/s²
t = √600s²
t = √100 * 6s²
t = 10 √6 s ≈ 10 * 2,4s
t = 24s
V = g*t
V = 10m/s² * 24s = 240m/s
1 5 1