Apparent weight in an elevator. Suppose you are in an elevator at the top floor of a multi-story building. The elevator is going down which was initially at rest. What would be your apparent weight in three phases showed in figure? n.b. What happens with the velocity of elevator when it is going down?

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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?”