..above horizontal? Suppose that μk = 0.35.

**Answer 1**

Constant speed means Fnet = 0.

Let m = mass of wood block and Θ = angle of ramp then

if µk = 0.35:

Fnet = 0 = mg(sin Θ) – (µk)(mg)(cos Θ)

mg(sin Θ) = µk(mg)(cos Θ)

µk = tan Θ

Θ = arctan(µk) = arctan (0.35) ≈ 19.3° ANS