Two particle, each of mass m, are connected by a light inextensible string of length 2l. Initially they lie on a smooth horizontal table at points A ad B distant l apart the particle at A is projectd across the table with velocity u. find th speed with which the second particle begins to move if the direction. of u is :
(a). along BA
(b). at an angle of `120^(@)` with AB
(c) perpendicular to AB
In each case also calculate (in terms of ma nd u) the impulsive tension in the string.