A block of mass m1 = 17.4 kg is on a frictionless table to the left of a second block of mass m2 = 23.2 kg, attached by a horizontal string (see the figure below). HINT Two masses, m1 and m2, are placed on a horizontal surface such that they do not touch and m1 is to the left of m2. The left and right ends of a string are, respectively, attached to m1 and m2. A horizontal rightward arrow labeled vector F extends from m2. (a) If a horizontal force of 1.73 ✕ 102 N is exerted on the block m2 in the positive x-direction, use the system approach to find the acceleration (in m/s2) of the two blocks.  m/s2 (b) What is the tension (in N) in the string connecting the blocks?  N

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”