Alex is asked to move two boxes of books in contact with each other and resting on a frictionless floor. He decides to move them at the same time by pushing on box A with a horizontal pushing force p =7.5N.  Box A has a mass = 10.5 kg and box B has a mass 7.0 kg. The contact force between the two boxes is F and N denotes the normal force.  A) What is the acceleration (in m/s to the 2nd) of the two boxes B) What is the force (in N) exerted on mb by ma?  C) If Alex were to push from the other side on the 7.0 kg box, how would your answer to part (b) change?

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