can sum1 show the working?
Two particles A and B each of mass m are attached by a light inextensible string of length 2l. The whole system lies on a smooth horizontal table with B initially at a distance l from A. The particle at end B is projected across the table with speed u perpendicular to Ab. Velocity of ball A just after the string is taut, is:
-
UP 0 DOWN 0 0 2