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What is the coefficient of kinetic friction between the box and board?

A box slides down the length of a board elevated to form a ramp. The board is 2 m long and elevated to an angle of 30°. When the box reaches the bottom of this ramp it moves at a speed of 3.1 m/s. What is the coefficent of kinetic friction between the box and board?



Please....HELP!

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1. this section is just to discuss physics theoretical problems.
   
   why you want just a calculated answer while you can discuss how to solve this question and the questions similar to this.
   
   if you want just a numerical answer then for this there is HOMEWORK SECTION.