A bead of mass m rests on a vertical smooth parabola x^2 = c y at (-a , b) as shown in the figure. the required value of angular velocity ω is

Q: A bead of mass m rests on a vertical smooth parabola x² = c y at (-a , b) as shown in the figure. the required value of angular velocity ω is

(a) $\sqrt{\frac{2 g}{a}}$

(b) $\sqrt{\frac{2 g}{c}}$

(c) $\sqrt{\frac{2 g}{b}}$

(d) $\sqrt{\frac{2 g c}{a b}}$

Ans: (b)