the second largest mass exhibit the same data collapse when plotting them as a function of $v_n$ further supporting the above arguments.

The functional form of the two largest fragment masses in Fig. \[maxmas\] shows the existence of two distinct regions. At low impact velocity, breakage takes place only at the impact point and the largest fragment is nearly equal to the original mass. As the velocity of impact increases, more small fragments are chipped off from the impact point and cracks start around the damaged conical region and move towards the outer surface of the disc. At the critical velocity $v_c$ these propagating cracks reach the outer surface opposite to the impact point and the largest fragment break into several big pieces. The impact velocity where the second largest mass attains its maximum value or where there is an inflexion point in the largest fragment mass curve coincides with the critical velocity defined by analyzing the cracking pattern in Figs.\[snapshots\],\[snapshot\]. In our case for normal impact of a system of $30$ cm radius the critical velocity turned out to be $250$ cm/sec.

The quality of the data collapse of the curves in Fig. \[maxmas\] obtained at different impact velocities 