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General
Easy
Question
A 40 kg slab rests on a frictionless floor as shown in the figure. A 10 kg block rests on the top of the slab. The static coefficient of friction between the block and slab is 0.60 while the kinetic friction is 0.40. The 10 kg block is acted upon by a horizontal force 100 N. If 
, the resulting acceleration of the slab will be
The correct answer is:
Limiting friction between block and slab
But applied force on block A is 100 N. So the block will slip over a slab.
Now kinetic friction works between block and slab 
This kinetic friction helps to move the slab
Acceleration of slab
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