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g=10m/s²
h=gt²/2
5=5t²
t²=1
t=1
g=v/t
v=g*t
v=10*1
v=10m/s
ODP. uderze z prędkością 10m/s
h = Vo² / 2g
5m = Vo² / 20 m/s²
Vo = √100 m²/s²
Vo = 10 m/s