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r = 30cm = 0,3m
Fd = 3N
Fd = mv^2/r |*r
Fd*r = mv^2 |:m
v^2 = Fd*r/m
v = VFd*r/m (V - pierwiastek)
v = V3*0,3/0,1 = V9 = 3 (m/s)