A lantern falls from the top of a building in such a way that after tseconds, it is h(t) =...

A lantern falls from the top of a building in such a way that after tseconds, it is h(t) = 150 −16t2 feet above ground. A woman 5 feet tall originally standing directly under the lantern sees it start to fall and walks away at the constant rate of 5 ft/sec. How fast is the length of the woman’s shadow changing when the lantern is 10 feet above the ground?

EXERCISE 72