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v^ / 2 = gh
v^ / 2 = gh / * 2
v^ = 2gh / [pierwiastek drugiego stopnia]
v = \/2gh <--- pod pierwiastkiem
v^ = 2 * 10 N/kg * 20 m
v^ = 20 m/s * 20 m
v^ = 400 m/s
v = 20 m/s
v=s/t
v=s/t / * t
s=vt / /v
t = s/v
t = 20 m / 20 m/s
t = 1s