Sphere A is attached to the ceiling of an elevator by a string. A second sphere is attached to the first one by a second string. Both strings are of negligible mass. m1=m2=m= 2.88kg. 1. The elevator starts from rest and accelerates downward with a= 1.35 m/s (power 2). What are the tensions in the two strings in newtons? 2. If the elevator moves upward instead with the same acceleration what will be the two strings in newtons? 3. The max tension the two strings can withstand is 91.3 N. What maximum upward acceleration  (in m/s [power 2]) can the elevator have without having one of the strings break?

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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?”