Answer :
The coefficient of kinetic friction on this surface is 0.1015.
What is coefficient of kinetic friction?
The ratio of the normal force to the kinetic friction force generated by contacting surfaces is known as the coefficient of kinetic friction. The numerical value of coefficient of kinetic friction is in between 0 and +1.
Given that: the box has a weight of 45 N.
The kinetic frictional force on the box is 4.05 N.
Hence, the coefficient of kinetic friction on this surface is =
kinetic frictional force /weight of the box
= 4.05 N / 40N
= 0.1015.
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