For a short time, the 250-kg roller-coaster car with passengers is traveling along the spiral track at a constant speed such that its position measured from the top of the track has components r = 10 m, θ = (0.2t) rad, and z = (-0.3t) m, where t is in seconds. Determine the magnitudes of the components of force which the track exerts on the car in the r, θ, and z directions at the instant t = 2 s. Neglect the size of the car.

r = 10 m