# Determine the Magnitude of the instantaneous Velocity

1. Sep 30, 2014

### Chris Carney

1. The problem statement, all variables and given/known data
Determine the Magnitude of the instantaneous velocity at T=5s
Function is x=AT^2 + B
A=2.1m/s^2
B=2.8 M

2. Relevant equations
The previous questions answered on this problem are:
AVG Velocity is 16.8
Displacement is 33.6 from 3s to 5s
3. The attempt at a solution
I'm not sure how to find either magnitude or instantaneous velocity. I need it broken down to the most basic steps to understand.

2. Sep 30, 2014

### phinds

Do you understand what the relationship is between position and velocity? Have you taken calculus?

3. Sep 30, 2014

### Chris Carney

I took calc and calc 2 about 4 years ago, I passed with A's but left school on military orders and have just gotten back into school. I forgot a lot of what I learned then.

4. Sep 30, 2014

### phinds

so, do you understand what the relationship is between position and velocity?

5. Oct 1, 2014

### Chris Carney

No, no I do not.

6. Oct 1, 2014

### phinds

Well, do you think maybe my repeatedly asking you about it is a hint to look it up?

I'm not trying to give you a hard time here, but part of what we do is try to help people learn how to get answers on their own, not spoon-feed answers. The relationship between position and velocity is extremely basic and one of the things that is generally brought up early in calculus so you really should study it a bit if you want to understand this kind of problem.