Two blocks connected by a light horizontal rope sit at rest on a horizontal, frictionless surface. Block A has mass 15.0 [kg], and block B has mass m. A constant horizontal force F = [60.0 N] is applied to block A. In the first 5.00 [s] after the force is applied, block A moves 18.0 [m] to the right. a. Draw the free body diagram of block A and Block B. Draw the x and y axis. (Hint: The string is taut all the time) b. What is the acceleration of block A in the first 5.00 [s] if both blocks start from rest? c.From your answer in (b), write the acceleration of block B.

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Newton’s Third Law of Motion

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?”