Answer:
0.4
Explanation:
F-Fr=ma where F is applied force, Fr is friction, m is mass and a is acceleration.
Since the mass is moving with a constant velocity, there's no acceleration hence
[tex]F=Fr=\mu N[/tex] where N is the weight of object and \mu is coefficient of kinetic friction.
[tex]F=\mu N and making [tex]\mu[/tex] the subject
[tex]\mu=\frac {F}{N}[/tex]
Substituting F for 8 N and N for 20 N
[tex]\mu=\frac {8}{20}=0.4[/tex]
Therefore, coefficient of kinetic friction is 0.4
