A man 6 feet tall walks at a rate of 5 feet per second away from a light that is 15 feet above the ground (see figure). 16 12 4 8 12 16 20 (a) When he is 10 feet from the base of the light, at what rate is the tip of his shadow moving? ] ft/sec (b) When he is 10 feet from the base of the light, at what rate is the length of his shadow changing? ft/sec

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