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h = 20 m
g = 10 m/s2
szukane:
v = ?
Z zasady zachowania energii:
Ep = Ek
mgh = mv^2/2 /:m
gh = v^2/2 I*2
v^2 = 2gh
v = V(2gh)
v = V(2 * 10 * 20) = V400
v = 20 m/s