A little boy pushes a wagon with his dog in it. The mass of the dog a nd the wagon together is 45 kg. The wagon accelerates at 0.85 m/s2. What force is the boy pulling with?
F=45 kg x .85 m/s^2 = 38.25 kg-m/s^2 = 38.25 N (pushing or pulling......the question states both)