Problem

Assertion : Velocity and acceleration of a particle in circular motion at some instant are:

\mathbf{v} = (2\hat{i}) \text{ ms}^{-1}

and

\mathbf{a} = (-\hat{i} + 2\hat{j}) \text{ ms}^{-2}

, then radius of circle is 2 m. Reason : Speed of particle is decreasing at a rate of

1 \text{ ms}^{-2}