r=50m
2Pir=2*3,14*50=314m
s=12*314m
s=3768m
t=4min=240s
Vśr=s/t
Vśr=3768m/240s
Vśr=15,7m/s
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r=50m
2Pir=2*3,14*50=314m
s=12*314m
s=3768m
t=4min=240s
Vśr=s/t
Vśr=3768m/240s
Vśr=15,7m/s