Block A has 15.0 kg in mass, and block B has mass m. A constant horizontal force F = 60N is applied to block A. In the first 5.00s after the force is applied, block A moves 18.0m to the right. a. What is the acceleration of block A and block B in the first 5.00 s if both blocks start from rest? b. Write Newton’s 2 law for block A along the horizontal direction and solve for the force exerted by the rope on block A c. Write Newton’s 2 law for block B along the horizontal direction and solve for its unknown mass m.

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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?”