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I=mR^2
v=w*R
Ek=mR^2*w^2/2=m(R*w)^2/2= mv^2/2
moment bezwladnosci kuli I=2/5mR^2
walc I=1/2mR^2
obrecz I=mR^2
moment bezwladnosci mR^2
kula Ek=2/5mv^2/2=1/5mv^2
walc 1/4Ek=1/4mv^2
obrecz Ek=mv^2/2.