Question

A mass of 2.0 kg is released from rest on a 30° inclinewithcoefficient of kinetic friction

μ = 0.20. The mass slides 10.0 m before reaching a springwithspring constant k = 40.0

N/m. How far with the spring compress before the massstops?

so this is how I approached this.... but I'm a bit stuck

so, F_s = -40.0 N/m * 10.0 m = -400 N

F_g - F_f = m*a

F_{g = m*a + Ff}

So, now I'm stuck... don't know how to find a, and even ifIdo, I don't know how to finish the problem.

I'm not even sure I have the right approach here...

Thanks!