(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If a mass (.5 lb) is pushed down a ramp at a constant unknown force into a spring, compressing it 3 inches, what is the spring constant?

2. Relevant equations

Mass: .5lb

Time: 3 seconds

Length of ramp: 28 inches

inital height of ramp: 5.5 inches

final height: 0

ยต: .52

The ramp angle is 15^{o}to the ground

3. The attempt at a solution

I understand that if I set the equation up like this:

1/2mv^{2}_{o}+ mgh_{o}+ 1/2Kx^{2}_{o}+ Wnc = 1/2mv^{2}+ mgh + 1/2Kx^{2}

And plug in what I know, I will find the answer for the spring constant, But I'm having trouble finding the work of the non conservative forces. and the final and initial velocities. I just need help figuring them out so I can solve for K.

Thank you to anyone who helps :) I really appreciate it!

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# Homework Help: Energy - Finding Spring Constant

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