For a short time, the 250-kg roller coaster car is traveling along the spiral track such that its position measured from the top of the track has components r=8m, Theta=(0.1t+0.5) rad, and z=(-0.2t)m, where t is in seconds. Determine the magnitudes of the components of force which the track exerts on the car in the r, theta, and z directions at the instant t=2s. Neglect the size of the car.