2. A 6.8 kg object is moving along a rough horizontal surface at a constant speed of 2.0 m/s. It is being pushed across by a horizontal force F.At a certain position x = 0.0 m, the magnitude of the horizontal force F is varied given by the graph below. F (N) 15.0 10.0 4.0 10.0 x (m) While the horizontal force is increased, the magnitude of the friction acting on the object remains the same. What is the speed of the object at x = 10.0 m? 3.4 m/s 4.0 m/s 6.4 m/s 6.7 m/s

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Q: Problem #2 R-150 Lbs Length FR- 15 feet Length FE- S fet Calculate E Calculate MA

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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?”