Physics problem

[Andrez]

I'm stuck on this, can anybody help me out? It's like I'm missing a link...

A mass m = 0.02 kg slips down a sloped plane (smooth, no friction). At the end of the slope it slips across a path with friction (ud = 0.1) and finally it hurts a spring fixed to a vertical wall, which at rest it's L0 = 10 cm and a constant of k = 2 N / m. The distance between the end of the slope and the wall is d = 40 cm. Considering that at t = 0 the mass v = 0, we need to know:

a - the height needed to make the mass hit the spring with a force that allows the mass itself to touch the wall

b - the height the mass reaches when it bounces back from the wall

Here's a simple draw of the problem: