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The friction coefficient between the two...

The friction coefficient between the two blocks shown in figure is `mu` but the floor is smooth. (a). What maximum horizontal force F can be applied without disturbing the equilibrium of the system? (b).Suppose the horizontal force applied is double of that found in part (a). Find the accelerations of the two masses.

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`(a) 2mu mg,(b) (2mu mg)/(M+m)` in opposite direction
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