Answer: 0.6
Explanation: I don't know the explanation and i don't know how to find the answer but i promise the answer is 0.6
The coefficient of kinetic friction between the object and the surface is 0.6
The formula for calculating the force of friction is expressed as:
[tex]F = \mu R[/tex]
F is the frictional force
[tex]\mu[/tex] is the coefficient of friction
R is the normal reaction
For the object on the surface, its weight is equal to the normal reaction and the frictional force is equal to the moving force;
W = R = 20N
F = Fm = 12N
From the equation above:
[tex]\mu =\frac{F}{R} \\\mu = \frac{12}{20}\\\mu = 0.6[/tex]
Hence the coefficient of kinetic friction between the object and the surface is 0.6
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