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prędkość-v
czas-t
a=v/t
v=19.6 m/s
t=2s
a=19.6 m/s : 2s=9.8 m/s 2
a=9.8 m/s2
2V=at2
2V/t2= a
V=19.6
t=2s
2*19,6/2*2=a
a=39.2/4
a=9,8