I’ve come across a physics problem and attempted to solve it, but I’ve forgotten a lot of it and haven’t arrived at a solution. See the attached pic.

Can someone guide me in the right direction or solve it?

I’ve tried

sin 30º = h / PQ

1/2 = 2 m / PQ

PQ = 4 m

Fg * cos 30º * 4m * μ = Fg * x * μ

cos 30º * 4m = x

sqrt(3)/2 * 4m = x

x = 2 * sqrt(3)

Anyhow, I fail to obtain μ and I feel like my approach is wrong and x is thus also wrong.