Question

Two bodies move in a straight line towards each other with initial velocity v1 and v2 and with constant acceleration a1and a2 directed against their corresponding initial velocities. The maximum initial sepration Lmax between them for which they will meet during the motion is. :-

Answer 1

relative velocity =v1+v2
acceleration =a1+a2
so lmax=(v1+v2)^2/2a1+2a2