Two blocks each of mass m 3.56 kg are fastened to the top of an elevator as in the figure below. T T m (a) If the elevator has an upward acceleration a 1.60 m/s2, find the tensions T, and T, in the upper and lower strings. T1 = T2 = (b) If the strings can withstand a maximum tension of 89.0 N, what maximum acceleration can the elevator have before the upper string breaks? m/s?

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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?”