Question

jenny if flying a kite at a constant height above level group of 72m. The wind carriers the kite away horizontally at a rate 6m/s. how fast must jenny let out the string at the moment when the kite is 120m away form her?

Answer 1

using Pythagoras, i know that at 120m, the distance the kite has travelled is 96m horizontally

Answer 2

find out the hypotenuse and say it`s c

the a^2 + b^2 = c^2
then differentiate wrt time and see what you get