A block slipping on a rough horizontal plane moves with deceleration of 4.0m/s2. The coefficient of kinetic friction between the blocks and the plane is:
A
0.4
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B
0.3
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C
0.2
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D
0.1
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Solution
The correct option is C 0.4 The friction force =F=ma
where m is mass and a= deceleration of the body=4.0m/s2
so f=4mN
Normal force= weight of the body =mg
So coefficient of kinetic friction 4m/mg
=4/g
=4/10
=0.4
Hence the coefficient of kinetic between the block and lane is 0.4