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Two blocks having masses 8kg and 16kg ar...

Two blocks having masses `8kg` and `16kg` are connected to the two ends of a light spring. The system is placed on a smooth horizontal floor. An inextensible string also connects B with ceiling as shown in the figure at the final moment. Initially the spring has its natural length. A constant horizontal force F is applied to the heavier block as shown. What is the maximum possible value of F so the lighter block doesn't loose contact with ground?

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The correct Answer is:
30 N
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