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**1. Homework Statement**

A 2.0 kg wood block is launched up a wooden ramp that is inclined at a 30 ^\circ angle. The block's initial speed is 10\;{\rm m}/{\rm s}. The coefficient of kinetic friction of wood on wood is \mu_k=.200.

What speed does it have when it slides back down to its starting point?

**2. Homework Equations**

F=ma

v^2= vi^2 +2as

**3. The Attempt at a Solution**

I've found the net force along the x-axis, used that to find the acceleration along x. I used this acceleration in the kinematic equations but I keep getting the wrong answer. I'm positive I found the correct acceleration because I got the correct answer for the first part of the question, which asked how far the block travels up the incline. The answer is NOT 10 m/s...(which I completely do not understand why it isn't).