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Q=10m/s
V=0
H=v +qt2/2
H= 1/2 qt2
T=√(2h/v)
T=√(6m/(10m/s2))
T=√0,6
T=0,774s
lub sposób łatwy
s = 3m
a = g = 10m/s²
s = 1/2 a t²
√(2s/a) = t
t = √(2*3/10)
t ≈ 0,77s