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g=9,81m/s²
V=?
V=a*t
s=½*g*t²
20m=½*9,81m/s²*t²
20m=4,905m/s²*t²
t²=20m/4,905m/s²
t=√20m/4,905m/s²
t≈4s
V=9,81m/² * 4s
V≈39,24m/s
Odp. Szybkość kamienia wynosi około 39,24m/s