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w ciągu 4 min 480m
w ciągu 6 min x
x=6 × 480 ÷4
x=720m
v=7,2km/h
72km/h= 20m/s
30m/s=108km/h
V=s/t
V=480m/240s=2m/s
droga w czasie t2=3/20h=9min=540s
S=540sx2m/s=1080m
72km/h = 72 x 1000m / 3600s =20m/s
30m/s = 30 x 0,001km x 1/3600 h = 108km/h