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Laws of Motion
Question
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A block is supported by a cord A from a rigid support and another cord B is attached to the bottom of block as shown. If we pull the string B steadily then which of the two cords will break? Assume cords A and B are identical.

Answer

When string B is pulled with force F, then
Tension in string B = F
Tension in string A = F+ mg.
                        
Since tension in cord A is greater than in B, therefore, cord A will break. 

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