Here is the text of my problem:
A boy is flying a kite at a height of 150ft. If the kite moves gorizontally away from the boy at 20ft/s, how fast is the string being paid out when the kite is 250ft from him?
Given:
Find:
- y=150ft
- x=250ft
Work:
- by the theorem of pythagoras:
The book goves an answer of 16ft/s. Can someone give me a hint of where I might have gone astray? Thanks!