1. The problem statement, all variables and given/known data Two identical balls are interconnected with a massless and inextensible thread. The system is in gravity free space with the thread just taut. Each ball is imparted a velocity v, one towards the other ball and the other perpendicular to the first, at t=0. Then, (A)The thread will become taut at t=L/v (B)the thread will become taut at some time t<(L/v) (C)The thread will always remain taut for t>(L/v) (D)The kinetic energy of the system will always remain mv^2. The correct options are (A) and (C). 2. Relevant equations m1u1 + m2u2 = m1v1 + m2v2 KE= 1/2 mv^2 3. The attempt at a solution There is no collision!!! How do I even start?