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**1. Homework Statement**

a.) a box slides down a 30 degree ramp with an acceleration of 1.20 m/s^2. Determine the kinetic friction between the box and the ramp.

**2. Homework Equations**

**3. The Attempt at a Solution**

the equation is uk=Fk/Fn but they did not provide me with atleast one force or one mass to figure out the Force normal or even force gravity so i am completely lost. please help.