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r = 40cm = 0,4m
T = 130/min = 2,16/sek
π=3,14
v = 2π*0,4/2,16 = 0,8π/2,16 = 2,51/2,16 = 1,162m/s
l≈2*3,14*0,4m=6,28*0,4m=2,512m
130okr/min*2,512m=326,56m/min≈5,4m/s≈19,6km/h