# Thread: Velocity problem!

1. ## Velocity problem!

Today was the first day of school and i'm in calculus right now and i do not know how to do this problem....

If a ball is thrown into the air with a velocity of 40 ft/s, its height in feet t seconds later is given by y=40t-16t^2.
(a) Find the average velocity for the time period beginning with t=2 and lasting:

(i) 0.5 second
(ii) 0.1 second
(iii) 0.05 second
(iv) 0.01 second

(b) Estimate the instantaneous velocity when t=2.

Please help!

2. i doubt someone will be up at 12 am to help me. well it depends on what time zone people are in. but I'm in pacific time and its 12:10 am and I've tried this problem numerous times .

3. Originally Posted by yoman360
Today was the first day of school and i'm in calculus right now and i do not know how to do this problem....

If a ball is thrown into the air with a velocity of 40 ft/s, its height in feet t seconds later is given by y=40t-16t^2.
(a) Find the average velocity for the time period beginning with t=2 and lasting:

(i) 0.5 second
(ii) 0.1 second
(iii) 0.05 second
(iv) 0.01 second

(b) Estimate the instantaneous velocity when t=2.

Please help!
The intervals in question:

$\displaystyle [2,2.5],[2,2.1],[2,2.05],[2,2.01]$

So do what I told you to do in the other thread you posted.

However, for b), just make an educated guess as to what the velocity at t=2 would be.

4. Originally Posted by yoman360
i doubt someone will be up at 12 am to help me. well it depends on what time zone people are in. but I'm in pacific time and its 12:10 am and I've tried this problem numerous times .
It's 3:13am here.