Three blocks, each of mass 8 kg are on a frictionless table. A hand pushes on the left most box (A) such that the three boxes accelerate in the positive horizontal direction as shown at a rate of a = 0.7 m/s2. Here are the ones I got right: 1. What is the magnitude of the force on block A from the hand? Answer: 16.9-Correct 2. What is the net horizontal force on block A ? Answer:5.6-Correct And now the ones I cant figure out: 3. What is the horizontal force on block A due to block B? and 4. What is the net horizontal force on block B? For number 3, I tried subtracting (0.7*3) from total force of 16.9 but that was incorrect. Not sure how to approach this one.