56. A solid sphere rolls down an inclined plane and its velocity at the

A solid sphere rolls down an inclined plane and its velocity at the bottom is v₁. Then same sphere slides down the plane (without friction) and let its velocity at the bottom be v₂. Which of the following relation is correct

(a)    v₁ = v₂

(b)    v₁ = 5/7v₂

(c)     v₁ = 7/5 v₂

(d)    None of these

Ans. d