NEET 2026, Physics Q3: Kinematics and Dynamics of Rotational Motion

Convert to rad/s: ${\omega }_i=600$ rpm $=20\pi$ rad/s and ${\omega }_f=1200$ rpm $=40\pi$ rad/s, with $t=10$ s.

For uniform angular acceleration, the angle swept is

$\theta =\left(\frac{{\omega }_i+{\omega }_f}{2}\right)t=\left(\frac{40\pi +20\pi }{2}\right)\times 10=300\pi$ rad.

Number of revolutions $=\frac{\theta }{2\pi }=\frac{300\pi }{2\pi }=150$.