1. The problem statement, all variables and given/known data AP French Mechanics Problem 7-1 Two identical gliders, each of mass m, are being towed through the air in tandem. Initially they are traveling at a constant speed and the tension in the tow rope A is T(sub0). The tow plane then begins to accelerate with an acceleration A. What are the tensions in A and B immediately after this acceleration begins? Crude Drawing Glider2 (Mass m) ---- rope B ----- Glider1 (Mass m) ----- rope A ------ Tow Plane (Initially at Rest then accelerating) 2. Relevant equations/ 3. The attempt at a solution This is what I tried: Initially at constant velocity: Forces on Glider1: T(rope A) - T(rope B) = 0 Since T(ropeA) == T(sub0), then T(ropeB) == T(sub0) When Tow Plane Starts to Accelerate: 1) I assumed that entire system accelerated the same Forces on Glider1: T(ropeA) - T(ropeB) = m * a (1) (where m is mass of Glider 1) Forces on Glider2: T(ropeB) = m* a (2) (where m is mass of Glider2) Therefore, substituting, equation (2) into equation (1), T(ropeA) = 2*m*a. However, in the back of the book the answer states: T(ropeA) = T(sub0) + 2ma T(ropeB) = .5 * T(sub0) + ma I just want to know why the initial condition of T(sub0) is included, though I assume it is because of the constant velocity at the beginning and the plane accelerating in relation to that initial velocity, Also, if it would helpful if someone could point out flaws in my logic. Thanks.