Hooke's Law on a Slope with friction.

[RCulling]

Homework Statement

Question is in attachment

Homework Equations

The Attempt at a Solution

I mananged to find the acceleration up the slope but cannot get any further than this?
- can someone please give me hint; push in the right direction

Thanks :D

 

[RCulling]

Better image here

 

[radou]

Hint (again): energy conservation.

 

[K^2]

Solve it as a harmonic oscillator, but add a constant to the position, so that x(0)=constant. Solve for that constant, and the rest should follow.

Edit: Oh, wow, energy conservation is a lot easier. Never mind.

 

[RCulling]

Mmm energy conservation i get, I am just trying to figure out the work done?
I've the force at the most compressed point, but it changes over the 0.2m it acts upon?
- what am i missing?

 

[K^2]

You can separate out the work done against friction. Kinetic energy is trivial. All that's left is to consider gravitational and spring potentials at 0 and at D.

 

[RCulling]

Ok thanks for the helping hints, i'll post back if i still can't get it

- Cheers :D