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General
Easy
Question
Three blocks A,B and C of equal mass m are placed one over the other on a frictionless surface. The coefficient of friction between any blocks A,B and C is 
. The maximum value of mass of block D so that the blocks A,B and C move without slipping over each other is
The correct answer is:
Maximum acceleration of B or C can be mg so that they do not slip on A. For the system of (A+B+C)
T= 3 ma = 3 m mg
For D
mg-T= Ma
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