A flywheel starts from rest and is given a constant angular acceleration of for

PHYSICS · Subjective · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion

Problem

A flywheel starts from rest and is given a constant angular acceleration of

2\,\text{rad}\,\text{s}^{-2}

for

4\,\text{s}

. Immediately afterwards, a constant angular deceleration of

-3\,\text{rad}\,\text{s}^{-2}

acts for the next

3\,\text{s}

. Without doing any calculation, state at which instant (

t=4\,\text{s}

t=7\,\text{s}

) the magnitude of angular velocity is greatest and give one brief reason.