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A system of two blocks of masses m = 2 kg and M = 8 kg is placed on a smooth table as shown in figure. The coefficient of static friction between two blocks is 0.5. The maximum horizontal force F that can be applied to the block of mass M so that the blocks move together will be

1. 9.8 N
2. 39.2 N
3. 49 N
4. 78.4 N

Correct answer: 49 N

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