Question

A particle undergoes uniform circular motion in a horizontal plane. The radius of the circle is 10 cm. The centripetal force acting on the particle is 20 N. Its kinetic energy is

• A. 0.1 J
• B. 0.2
• C. 2.0 J
• D. 1.0 J

Answer 1

The correct option is D 1.0 J

$\frac{m{v}^2}{r}=20\Rightarrow \frac{1}{2}m{v}^2=20\times \frac{r}{2}=1J$