1. The problem statement, all variables and given/known data A series of weights connected by very light cords are given an upward acceleration of 4.00 m/s2 by a pull P, as shown in Fig. 5.3.( a verticle strand of 4 balls with mass 5,10,15,and 20 kg with the pull at the top) A, B, and C are the tensions in the connecting cords. the pull P is closest to: 290 N 690 N 50 N 200 N 490 N 2. Relevant equations F= ma 3. The attempt at a solution treating the weights as one mass Pull-mg=ma pull=m(a+g) = 552 Which is not one of the answers. What is the error in my logic?