Physics - Kinematics Question with Solution | TestHub

The position$x$ of a particle with respect to time$t$ along the$x$-axis is given by$x=9t^2-t^3$where$x$ is in metres and$t$ in second. What will be the position of this particle (in$\mathrm{m}$) when it achieves maximum speed along the positive $x$-direction?