A hand pushes block A (ma = 3 kg) with a constant force Nand. A 75 N for a distance Ax = 2 m along a (mostly) frictionless table such that it speeds up from rest and is traveling at a speed of 8 m/s after it slides over a rough section of the table (u = 0.4). Block A then collides with a more massive block B (m = 6 kg) that is initially at rest. What type of a collision are we looking at?

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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?”