This simulation illustrates the interesting fact that the acceleration down the slope and thereby the terminal velocity depends on the skier's mass. The reason for this is that the net force acting on the skier equals the sin(theta) gravity component minus friction minus air drag:

m*A = m*g*sin(theta) - mu*m*g*cos(theta) - (Cd*Ap*rho*V^2)/2

if we divide by mass, we get

A = g*sin(theta) - mu*g*cos(theta) - (Cd*Ap*rho*V^2)/(2*m)

The mass appears in the denominator of the last term, which explains the mass/speed relation (a heavier skier is faster).