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A block of mass M is placed on a horizontal surface and it is tied with an inextensible string to a block of mass, as shown in figure. A block of mass m0 is also placed on M. If friction force exists between the block M and the block m0 and not between the block M and the horizontal surface, then the minimum value of 
for which the block m remains stationary is
- none of these
The correct answer is: none of these
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