Two balls having masses m and 2m are fastened to two light strings of same length l which is held horizontally[say x axis, with the mass 2m at (l,0) and mass m at (-l,0)]. The strings are kept fixed at origin. This system is released from rest. Collision between the balls is elastic in nature.
a- find the velocities of the balls just after their collision and
b- how high will the balls rise after collision ?
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