A moving shadow A light shines from the top of a pole 50 ft high. A ball is dropped from the same height from a point 30 ft away from the light. (See accompanying figure.) How fast is the shadow of the ball moving along the ground 1/2 sec later? (Assume the ball falls a distance s = 16² ft in t sec.) Light Ball at time t = 0 1/2 sec later 50-ft pole Shadow x(1) 30

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