The two objects in the figure are connected by a massless cable which passes over a massless and frictionless pulley, and mass m2 is on a horizontal frictionless surface. Assuming gravity acts downward in the figure, and the objects are moving with a common acceleration as m1 falls downward, what is the acceleration of the system? A) 2.45 m/s^2 B) 4.9 m/s^2 C) 7.35 m/s^2 D) 9.8 m/s^2

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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?”