An elementary school science project portrays the inner solar system with a series of hanging, connected weights, as in the figure. A child pulls upwards with a force P, causing an upward acceleration of magnitude 0.73 m/s². Determine the magnitude of P if m=4 kg. P m 2m 3m

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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?”