A man 6 feet tall walks at a rate of 5 feet per second toward a street light that is 16 feet tall. At what rate is the length of his shadow changing when he is 10 feet from the base of the light?
draw a line from light top to man top extentending to ground.
. a triangle is formed . let size of shadow be x and distance between man and pole be y at any time t.
u see that . x/(x+y)=6/16
differentate wrt t