15) in its axle. The pulley is initially not turning. A constant force of 42.5 N is applied to the string, which does not slip, causing the pulley to rotate and the string to unwind. If the string unwinds 1.2 m in 4.9 s what is the moment of inertia of the pulley? A string is wrapped around a pulley with a radius of 2.0 cm and no appreciable friction

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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?”