A cruise ship with a mass of 1.1 × 107 kg strikes a pier at a speed of 0.95 m/s. It comes to rest 6.2 m later, damaging the ship, the pier, and the tugboat captain’s finances. 1) Calculate the average force, in newtons, exerted on the pier. Take the motion of the cruise ship to be in the positive direction.

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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?”