There block A B ,and C of equal mass m a...

There block A B ,and C of equal mass `m` are placed one over the other on a frictionless surface (table) as shown in figure The coefficient of friction between any blocks A ,B and C is `mu` The maximum value of mass of block D so that the blocks A,B and C move without slipping over each other is

`( 3 m mu)/( mu+1)`

`( 3m ( 1-mu))/( mu)`

` (3m ( 1+ mu ))/( mu )`

` ( 3 m mu )/((1- mu ))`

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