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For minimum value of mu ,mass M does not...

For minimum value of `mu` ,mass M does not move.When `m_(1)`=1kg , `m_(2)`=2kg , M=3/2kg .The surface between `m_(1)` & M, `m_(2)` & M are smooth. If `(1)/(mu)=(alpha)^(3/2)` then find out the value of `alpha` .(`mu` is coefficient of friction between M and horizontal surface) `g=10ms^(-2)`

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