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t=√2S/g
t=2s
s = 20m
g = 10m/s2
Szukane:
t = ?
a = 10m/s√ 2
s = 1/2 * at√ 2
20m = 1/2 * 10 * t√2
t√2 = 4
t = 2 s
Odp: Czas spadania tej kulki to 2s