A wooden block slides directly down an inclined plane, at a constant velocity of 6.0 m/s. What is the coefficient of kinetic friction, if the plane makes an angle of 25° with the horizontal?

Explanation:

As wooden block has a two-dimensional and slides down an inclined plane at constant speed. The following equations of equilibrium are:

Normal force is:

Then, it is introduced in the remaining equation, which is simplified afterwards:

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