1. The problem statement, all variables and given/known data Two bodies A and B of equal mass m, connected by a light inextensible string, are placed on a smooth horizontal table with the string just taut. A is projected with velocity U at 45 degrees to the direction AB. Determine the impuslive tension in the string when it becomes taut. 2. Relevant equations 3. The attempt at a solution Well, following from previous examples i tried to find the momentum in direction AB and perpendicular to AB. Momentum in direction AB mu + mu = U cos45 2mu = Ucos45 u = (Ucos45) / 2m Momentum perpendicular to AB mv = U sin45 v = (Usin45)/m Impulsive Energy at A T = mu = (Ucos45)/2 = (U * 1/root2)/2 I think i've gotten it wrong. answer should be 1/4 m U root 2. can anyone help me out? I don't know if it's an algebra problem or (most likley) a method problem.