Calculating Speed of Kite String Release for 120ft Kite Flight

[killykilly]

Homework Statement

A girl is flying a kite, which is at a height of 120 feet. The wind is carrying the kite horizontally away from the girl at a speed of 10 feet per second. How fast must the kite string be let out when the string is 150 feet long ?



I came from a non english speaking country. I can't understand question well.

 

[gneill]

I came from a non english speaking country. I can't understand question well.

Why not try to restate the problem in your own words? Then maybe we can see where your misunderstanding is.

 

[Redbelly98]

Welcome to Physics Forums.

Is this problem really from a physics class? It looks like a calculus problem.

Homework Statement

A girl is flying a kite, which is at a height of 120 feet. The wind is carrying the kite horizontally away from the girl at a speed of 10 feet per second. How fast must the kite string be let out when the string is 150 feet long ?
I came from a non english speaking country. I can't understand question well.

"Height" refers to the vertical distance that the kite is above the ground.

How long the string is, would mean the distance between the girl and the kite. Assume that the string forms a straight line between the girl and kite.