# The KE of a particle moving along a circle of radius r is K = β x^2 , where x is the distance covered. What is the force acting on the particle ?

Q: The KE of a particle moving along a circle of radius r is K = β x2 , where x is the distance covered. What is the force acting on the particle ?

(a) $2 \beta (1 – \frac{r^2}{x^2})$

(b) $2 \beta \frac{r^2}{x^2}$

(c) $2 \beta x$

(d) $2 \beta x (1 – \frac{r^2}{x^2})^{1/2}$

Ans: (d)