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t = 0,2s
Długość okręgu L = 2*pi*r
L=2pi*40
L = 2*3,14*40 = 251,2cm = 2,512 m
V = L/t
V = 2,512/ 0,2
V = 12,56 m/s
Prędkość liniowa tego ciała wynosi 12,56 m/s.