A child applies a force F parallel to the z-axis to a 5.00 kg sled moving on the frozen surface of a small pond. As the child controls the speed of the sled, the z-component of the force she applies varies with the z-coordinate of the sled as shown in figure (Figure 1). Suppose the sled is initially at rest at z =0. You can ignore friction between the sled and the surface of the pond. Part A Use the work-energy theorem to find the speed of the sled at 8.0 m. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Motion on a curved path. Express your answer to two significant figures and include the appropriate units. HA ? Value Units Submit Request Answer Part B Use the work-energy theorem to find the speed of the sled at 12.0 m. Express your answer to two significant figures and include the appropriate units. Figure < 1 of 1 F (N) Value Units 10 Submit Request Answer Provide Feedback x (m) 12 8. 4. 5.

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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?”