<span>a=v^2/R</span><span>v=2пи*R/t</span><span>v=пи*r/3t </span><span>r=3tv/пи</span><span>a=v^2*пи/3tv=пи*v/3t = 3.14*10/3 = 10.5</span>
Ер=mgh=>Eр=200*10*15=30000(Дж)=30кДж