Physics - Kinematics Question with Solution | TestHub

A sphere is fired downwards into a medium with an initial speed of $27{\mathrm{ms}}^{-1}$. It experiences a deceleration of $\mathrm{a}=(-6\mathrm{t}){\mathrm{ms}}^{-2}$, where t is in seconds. If the distance(in metre) travelled before it stops is $9\alpha$. Then find the value of $\alpha$.