A. Label the graphs as Position, Velocity or Acceleration B. Which of the following situations, consistent with your answer to Part (a), is most accurately represented by the graphs?  A car driving in the negative x direction suddenly shifts into reverse, and, with tires spinning, slows to a momentary stop before beginning to move in the positive x direction.  A rock is dropped from rest from the top of a tall building. The positive direction is upward, and drag may be neglected.  A sprinter runs a 100-meter dash in the negative x direction. Starting from rest, she has a constant acceleration for the first 50 meters followed by a constant speed for the remaining 50 meters.  A car driving in the positive x direction slams on its brakes and comes to rest.

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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?”