A disc of radius `10 cm` rotates in `XY` plane about an axis passing through its centre and perpendicular to the plane. At a particlular moment a point A on the disc has an acceleration `vec a_(A) = - 6 hat I m//s^(2)`.
The angular acceleration of disc is :
A. `48 rad//s^(2)` anticlockwise
B. `12 rad//s^(2)` anticlockwise
C. `48 rad//s^(2)` clockwise
D. `12 rad//s^(2)` clockwise.
