Question

A particle initially at rest performs circular motion with uniform angular acceleration 0.2 rad/$s^2$. What speed will it attain in 10 seconds?

• A. 2 rad/s
• B. 0.2 rad/s
• C. 22 rad/s
• D. 10 rad/s

Answer 1

The correct option is A 2 rad/s

Given that Angular acceleration of the particle = $\alpha =0.2rad/s^2$

Using Ist equation of motion for circular motion we get

$\omega ={\omega }_0+\alpha t$

Since particle is at rest initially $\therefore {\omega }_0=0$

$⟹\omega =\alpha t=0.2\times 10=2rad/s$