A man 6 feet tall walks at a rate of 6 feet per second away from a light that is 15 feet above the ground (see figure). 12 8 - X 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 Need Help? Read It Watch It