1. The problem statement, all variables and given/known data An inventive child wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley (Fig. P4.79), the child pulls on the loose end of the rope with such a force that the spring scale reads 350 N. The child's true weight is 310 N, and the chair weighs 160 N. (a) Show that the acceleration of the child-chair system is upward and find its magnitude. (b) Find the force the child exerts on the seat of the chair. 2. Relevant equations F=ma 3. The attempt at a solution I solved for Part A and got it correct by going: 700-470=47.96a a=230/47.96 a=4.7956 which I rounded to 4.8 m/s^2 I'm having trouble with Part B. Here is the work I did so far: 310-350=-40 -40+160=120 N 350-120 N = 230 N However, this is wrong and I'm not sure where I went wrong. If someone could help me, I'd be very thankful.