# Terminal velocity of a ping pong ball

1. Dec 9, 2008

### guitarhero123

1. How long does it take a ping pong ball to reach terminal velocity?
2. What is the terminal velocity of a ping pong ball?

2. Dec 9, 2008

### tiny-tim

Welcome to PF!

Hi guitarhero123! Welcome to PF!

Is this a theory or an experiment question?

Anyway, show us what you've tried, and where you're stuck, and then we'll know how to help.

3. Dec 9, 2008

### Georgepowell

The Terminal Velocity is about 9.5 m/s

98% of which is attained after falling 12.5 m. (Im not sure of the time it takes to get to this)

Did you want to know the values? Or the working?

Here is the site.

4. Dec 9, 2008

### guitarhero123

I wasn't sure how to start working out the problem.
I was given this equation Vi+1=Vi+(g-c^2/m*Vi^2)t
im not sure if that makes sense or not i think its supposed to read velocity initial plus one equals velocity initial plus the quantity gravity minus c squared over mass times initial velocity squared times the change in time
We were told to determine the velocity every .1 second until we reach terminal velocity.
I'm sorry if this doesn't make sense I'm really lost.