- #1
squall325
- 2
- 0
Homework Statement
A street light is on top of a 20-foot pole. A person who is 5 feet tall walks away from the pole at the rate of 5 feet per second. At what rate is the tip of the person's shadow moving away from the pole when he is 20 feet from the pole?
2. The attempt at a solution
20/5 = y/y-x (similar triangles)
y = 4x/3 (to solve for x)
im stuck here...
i also checked another solution i got here but i don't know how he got dy/dt = (6/9)*5
https://www.physicsforums.com/showthread.php?t=114901