A person stands on a scale inside an elevator at rest (see the figure below). The scale reads W = 601 N.   (a) What is the person's mass?  kg (b) The elevator accelerates upward momentarily at the rate of a = 3 m/s2. What does the scale read then?  N (c) The elevator then moves with a steady speed of 7 m/s. What does the scale read now?  N

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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?”