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Q.

A block B of mass 5kg is placed on a slab A of mass 20kg which lies on a frictionless surface as shown in the figure. The coefficient of static friction between the block and the slab is 0.4 and that of kinetic friction is 0.2. If a force F = 25N acts on B, the acceleration of the slab will be

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a

zero

b

1 ms-2

c

0.4 ms-2

d

0.5 ms-2

answer is C.

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Detailed Solution

The maximum static friction is 20N

In this case both of the blocks will move together.

The combined acceleration will be a=Fm+M=255+20=1ms-2

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