Assertion: Torque on a body may be non-zero even if the net force acting on it is zero.
Reason: Force does not depend on point of application, but torque depends on point of application.

A child’s top is spun with angular acceleration $\alpha =4t^3-3t^2+2t$ where $t$ is in $\mathrm{seconds}$ and $a$ is in radians per second-square. At $t=0$, the top has angular velocity ${\omega }_0=2 \mathrm{rad} {\mathrm{s}}^{-1}$ and a reference line on it is at an angular position ${\mathrm{\theta }}_0=1 \mathrm{rad}$.
Statement $\mathrm{I}$: Expression for angular velocity $\omega =\left(2+t^2-t^3+t^4\right) \mathrm{rad} {\mathrm{s}}^{-1}$

Statement $\mathrm{II}$: Expression for angular position $\theta =\left(1+2t-3t^2+4t^3\right) \mathrm{rad}$