Freefall, is the answer really 20 ?

[EvilBunny]

Homework Statement

A lead ball is dropped into a lake from a diving board 5.0 m above the water. After entering into the water it sinks into the bottom with a constant velocity which it hit the water for 3 seconds. and hits the bottom of the lake. How deep is the late ?

Homework Equations

Vf ² - Vi ² = 2as

The Attempt at a Solution

Well I just used this equation and I get a velocity of 9.89 which I find odd. I think it should take less then 1 second to hit the water.

I get an answer of 29 meters by finding out the velocity and multipling by 3 seconds.
Altho in the answers it says 20.

 

[Mindscrape]

You should be right. It didn't say 2 seconds?

 

[learningphysics]

did you post the question exactly? Is the 3 seconds after it hits the water? I'm confused by this part:

"which it hit the water for 3 seconds. and hits the bottom of the lake"

 

[rocomath]

show more steps, i don't like the equation you used