1. The problem statement, all variables and given/known data A 50 g plastic cube slides up and down a 30 degree slope with friction. The plastic cube is pressed against a spring at the bottom of the slope, compressing the spring 10 cm. The spring constant is 25 N/m. When the plastic cube is released, what total distance will it travel up the slope before reversing direction if the coefficient of kinetic friction is 0.20. How far will the plastic cube travel up the slope? 2. Relevant equations spe=1/2kx^2 gpe=mgh ke=1/2mv^2 wf=uNd 3. The attempt at a solution spe=wf+gpe 1/2*25*.1^2=-.20*9.8*cos(30 degrees)*d+.05*9.8*h solve for d, can't solve equation, two unknowns? Tried to figure out h but couldn't.