A disc of circumference `s` is at rest at a point `A` on a horizontal surface when a constant horizontal force begins to act on its centre. Between `A` and `B` there is sufficient friction toprevent slipping, and the surface is smooth to the right of `B.AB = s`. The disc moves from `A` to `B` in time `T`. To the right of `B`,
.

Options

A. the angular acceleration of the disc will disappear, linear acceleration will remain unchanged
B. linear acceleration of the disc will increase
C. the disc will make one rotation in time T/2
D. the disc will cover a distance greater then s in further time T.

Answer

A

Explanation

To the right of B the friction force will disppear so `alpha=0`, linear acc. Increases so disc cover distance greater than s in time T to the right of B the `omega` is maximum and in `T//2` one revolution will complete