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**1. Homework Statement**

A physics student is performing an experiment to determine the coefficient of friction between a physics textbook and a 2.5 m wooden ramp. He places the textbook, which has a mass of 1.2 kg, on the inclined ramp and gradually increases the angle of the incline. At an angle of 30 degrees, the textbook starts to slip. It slides down the ramp in 4.0 s. Determine the coefficient of friction.

**2. Homework Equations**

**3. The Attempt at a Solution**

Well i was working on it with my friend in class, and he came up with

friction = tan 30 degrees = 0.58

but then, I dont think thats all to it right? Any help please?