# Homework Help: High school calc problem

1. Jan 28, 2008

### undrcvrbro

[SOLVED] high school calc problem

1. The problem statement, all variables and given/known data
If an object moves along the y axis (marked in feet) so that its position at time x (in seconds) is given by the indicated function; y= (x^3)-(9x^2)+15x;
Find when v=0

2. Relevant equations
v=y prime, and i already have found y prime to be (3x^2)-(18x)+15

3. The attempt at a solution
I checked the selected answers in the back of the book and did a little plug and chug and called it a day..... haha. I'm assuming theres a more relevant process so any help is mucho appreciated. thanks.

2. Jan 28, 2008

### rock.freak667

if v=y'

then shouldn't $v=3x^2-18x+15$

when v=0

$3x^2-18x+15=0$

try some factorisation

3. Jan 28, 2008

### undrcvrbro

wow...thank you

haha im not sure how i didn't see that. I really didn't think anyone would answer. I believe I've just found a new home for homework help....and considering I will be going into chemE next next year in college, I should be revisiting many of times!

haha thank you a lot!