A particle is rotating in a circular path and at any instant its motion can be described as θ=(5 t^4)/40-t^3/3. The angular acceleration of the…

A particle is rotating in a circular path and at any instant its motion can be described as $\displaystyle \theta=\frac{5 t^4}{40}-\frac{t^3}{3}$. The angular acceleration of the particle after $\displaystyle 10$ seconds is $\displaystyle \_\_\_\_$ $\displaystyle \mathrm{rad} / \mathrm{s}^2$.