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s=20m
t=?
s=at²/2
t²=2s/a
t=√(2s/a)=√(40/10)=√4=2s
g=10m/s²
t=?
s=½*g*t² przekształcamy wzór aby obliczyć t
2s=g*t²
t²=2s/g
t=√(2s/g)
t=√(40m/10m/s²)=√(4s²)=2s to jest czas spadania