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h = 20 m
g ≈ 10 m/s²
Szukane :
t = ?
Rozwiązanie :
s = 1/2at²
s = h
g = a
t = √s / 0,5 a
t = √ 20 / 0,5 * 10
t = 2 s
h=1/2·gt²
t²=2h/g=40/10=4
t=2[s]
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