A 40 kg slab rests on a frictionless floor. A 10 kg block rests on the top of the slab as shown in figure.
The static coefficient of friction between the block and the slab is 0.60 while the kinetic coefficient is 0.40. The 10 kg block is acted upon by a horizontal force of 100 N. If 
, the resulting acceleration of the slab will be
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Force of limiting friction for block 
If the applied force is greater than 58.8 N, then the block will move over the slab.
Kinetic friction acting on the block towards right
This is also equal to the force of friction acting on slab towards left. This is the only force acting on slab.
So, acceleration of the slab, 
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