The problem statement, all variables and given/known data The three blocks shown are relased at t=0 from the position shown in the figure. Assume that there is no friction between the table and M2, and that the two pulleys are massless and frictionless. The masses are: M1 = 2.00 kg M2 = 7.00 kg M3 = 4.00 kg Calculate the speed of M2 at a time 1.750s after the system is released from rest. (Question and diagram attached) The attempt at a solution I followed the way my professor did a similar question in my notes, however the answer is not correct. My process was as follows: For mass 1: ƩFnet = M1a T1 - M1g = M1a T1 = M1(a+g) T1 = 4(a+9.8) For mass 2: ƩFnet = M2a T2-T1 = M2a T2 = M2a - T1 T2 = 7a + 2a - 19.6 T2= 9a - 19.6 For mass 3: ƩFnet = -M3a T2 - W3 = -M3a T2 = W3 - M3a T2 = 39.2 - 4a I then made the two T2 equations equal to find acceleration of the system: 9a - 19.6 = 39.2 - 4a 9a + 4a = 58.8 a = 58.8/13 a = 4.523 m/s^2(right) Then I found velocity of M3 Vf = Vit + (1/2)at^2 Vf = (0)(1.750) + (1/2)(4.523)(1.750^2) Vf = 6.926 m/s Anyone know where I went wrong? I would seriously appreciate any help. I've tried this a bunch of times and have gotten different answers for acceleration every time, all of them wrong. I only have a few more tries left. Any guidance would bed a great help!