# Kinetic friction force

When the force $$F$$ is acting upon the right object with mass $$2$$ kg in the above diagram, both the left and right objects are in uniform motion. If the coefficient of kinetic friction upon the right object is $$0.5,$$ what is the magnitude of the force $$F$$ (in N)?

Gravitational acceleration is $$g= 10 \text{ m/s}^2$$.

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