Two blocks, each of mass 1.72 kg, hang from the ceiling of an elevator which accelerates upward with an acceleration of 1.50 m/s2. (See the figure.) Find the tension, T2, in 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?”