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mgh=1/2*mv²
gh=1/2*v²
20m * 10m/s² = 1/2v²
200m²/s²=1/2v²/*2
400m²/s²=v²/√
v=20m/s
v=s/t /*t
s=v*t/:v
t=s/v
t=20m/20m/s/ = 1s
Odp.: Spadało 1 sekundę