Q: A hollow sphere of mass m starting from rest rolls down, without slipping, on an inclined plane of inclination θ. What is the total energy of the sphere after 10^{-5} s if velocity after 10^{-5} s is v ?

(a)$ \displaystyle \frac{5}{6}mv^2 $

(b)$ \displaystyle \frac{2}{3}mv^2 $

(c)$ \displaystyle 10^{-5}mv^2 $

(d)$ \displaystyle \frac{mv^2}{10^{-5}} $

Ans: (a)