A horizontal force just sufficient to move a body of mass 4 kg lying on a rough horizontal surface is applied on it. The coefficient of static and kinetic friction between the body and the surface are 0.8 and 0.6, respectively. If the force continues to act even after the block has started moving, the acceleration of the block in 
is 
Text Solution
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The minimum force required to just move a body will be 
. After the motion is
started, the friction will become kinetic. So the force which is responsible for the increase in velocity of the block is
So 
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