Q. A particle does uniform circular motion in a horizontal plane. The radius of the circle is $20\ cm$. The centripetal force acting on the particle is $10\ N$. It’s kinetic energy is
A) $0.1\ J$
B) $0.2\ J$
C) $2.0\ J$
D) $1.0\ J$
Explanation
(d) $\frac{mv^{2}}{r} = 10 \Rightarrow \frac{1}{2}\ mv^{2} = 10 \times \frac{r}{2} = 1\ J$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.