Physics-

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### Question

#### Given . The coefficient of friction between A and B = 0.3, between B and C = 0.2 and between C, and ground, = 0.1. The least horizontal force F to start motion of any part of the system of three blocks resting upon one another as shown in figure is ( g = 10 )

- 60 N
- 90 N
- 80 N
- 150 N

#### The correct answer is: 60 N

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