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 a component r=8m theta=(0.1t + 0.5)rad z=(-0.2t)m were t is in seconds. Determine the magnitude of the components of force which the track exerts on the car in r, theta, andz direction when the time instant t=2s. Neglect the size of the car.