Dựa vào đồ thị:

`v_(max)=60(cm//s)`

`a_(max)=2(m//s)=200(cm//s)`

`=> v_(max)/a_(max)=(Aomega)/(Aomega^2)=3/10`

\(\Rightarrow \omega=\dfrac{10}{3}(rad/s)\\\Rightarrow T=\dfrac{2\pi}{\omega}=\dfrac{3\pi}{5}(s)\\\Rightarrow A=18(cm)\\S=18(cm)=1A\\\Rightarrow t_{min}=\dfrac{T}{6}=\dfrac{\dfrac{3\pi}{5}}{6}=\dfrac{\pi}{10}(s)\\\longrightarrow D.\)