# What formula can I use?

1. Sep 3, 2015

### JPaulPhysics

What formula can I use the time it takes an object to travel 402m if it starts at rest and accelerates at 17m/s?

2. Sep 3, 2015

### andrewkirk

$s=ut+\frac{1}{2}at^2$, where

s = distance travelled
u = initial velocity
t = time
a = acceleration

Use the formula for the solution to a quadratic equation to write t as a function of the other, known, variables.

3. Sep 3, 2015

Thank you

4. Sep 3, 2015

### Staff: Mentor

Welcome to the PF.

What is the context of your question? Is it for schoolwork, or a practical question from some situation? Schoolwork questions need to be posted in the Homework Help section of the PF, and there are rules for posting schoolwork questions there. We're here to help; we just need to treat schoolwork questions in a special way that helps student learn how to learn.

5. Sep 4, 2015

### Staff: Mentor

17m/s is not an acceleration, it is a velocity.

6. Sep 4, 2015

### mathman

Since u=0, you get t by a square root.