13-89. 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=105 m theta=(o.7t) rad and z =(0.5t)m where t is in seconds determine the components of force f F F which the slide exerts on him at the instant t = 2s neglect the size of the boy.

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