# HELP -How many meters does it take for a car to stop?

1. Sep 22, 2009

### merceb49

A race car can be slowed with a constant acceleration of -11 m/s squared
If the car is going 45 m/s, how many meters will it take to stop?
How many meters will it take to stop a car going half as fast?

2. Sep 22, 2009

### rock.freak667

Look up the kinematic equations of motion

3. Sep 22, 2009

### merceb49

1. what are those
2. i dont know how that helps.. all i need is an answer

4. Sep 22, 2009

### rock.freak667

http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/1DKin/U1L6a.html [Broken]

Last edited by a moderator: May 4, 2017
5. Sep 22, 2009

### merceb49

ok well i do not know what type of formula, how do i get it?

6. Sep 22, 2009

### rock.freak667

7. Sep 22, 2009

### merceb49

thank you for the link, but none of those equations work, there is no time involved in the situation. Are there any other ways, I'm looking for how many meters it will take for the car going 45m/s to stop at the constant rate of -11m/s squared

8. Sep 22, 2009

### jimz

Your observation that you do not need time to solve the problem is correct. The observation that all those equations involve time is not- look carefully.

9. Sep 22, 2009

### merceb49

thank you so much.