n the arrangement shown in figure, 5 kg block is placed on a rough table (µ =0.4) and a 3kg mass is connected at one end. then the range of mass m, for which the system will remain in equilibrium is
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Net vertical force on the block on the table is zero, 
.
The frictional force on the block is
If the block has a tendency to move in the rightward direction, the frictional force is in a leftward direction.
If the block has a tendency to move in a leftward direction, the frictional force will be in a rightward direction.
Therefore, the range of the mass 
is 1 kg to 5 kg .
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