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V2 = 2m/s
V1 = 2pi r / T
V2 = 2 pi (r + 0,5)/ T
V1 = V2 + 4
2 pi r / T= 2 pi (( r+ 0,5) / T )+ 4
pi r = pi ( r+ 0,5)/t + 2
r = (r+ 0,5) + 2
r = r + 2,5
Odp:
Promień to 2,5 m + 0,5m = 3m