Question

In a uniform circular motion, acceleration of the object is $80m/s^2$ and the radius is 5 m. Find out the angular speed of the object.

• A. 2 rad/s
• B. 4 rad/s
• C. 6 rad/s
• D. 8 rad/s

Answer 1

The correct option is B

4 rad/s

In uniofrm circular motion, we have only radial acceleration.

$a_r={\omega }^{2}r$
${\omega }^2=\frac{a_r}{r}$
$\omega =\sqrt{\frac{a_r}{r}}=\sqrt{\frac{80}{5}}=\sqrt{16}=4rad/sec$