A cubical block of side $30\;cm$ is moving with velocity $2 \;ms^{−1}$ on a smooth horizontal surface. The surface has a bump at a point $O$ as shown in figure. The angular velocity (in rad/s) of the block immediately after it hits the bump, is :

Question

$\begin{array}{1 1}(1) 9.4 \\ (2) 6.7 \\ (3) 5.0 \\ (4) 13.3 \end{array} $