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

Two blocks having masses `8 kg` and 16 kg are connected to the two ends of a light spring. The system is placed on a smooth horizontal floor. An inextensible starting also connects B with ceiling as shown in figure at the initial 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 contant with ground

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ANURAG MISHRA-WORK AND ENERGY-Eample
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