The boy of mass 40 kg is sliding down the spiral slide at a constant speed, such that his position, measured from the top of the chute, has components r=1.5m., theta=(.7t)rad, and z=(-.5t)m, where t is in seconds. Determine the components of force Fr, F(theta), and Fz, which the slide exerts on him at the instant t=2s. Neglect the size of the boy.