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

  • Thread starter merceb49
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  • #1
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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?
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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Look up the kinematic equations of motion
 
  • #3
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1. what are those
2. i dont know how that helps.. all i need is an answer
 
  • #4
rock.freak667
Homework Helper
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1. what are those
http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/1DKin/U1L6a.html [Broken]

2. .. all i need is an answer
PF doesn't work like that. We will help you arrive at the answer.
 
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  • #5
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ok well i do not know what type of formula, how do i get it?
 
  • #6
rock.freak667
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ok well i do not know what type of formula, how do i get it?
Read the link I posted and see which variables you have in your problem.
 
  • #7
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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
anything else, please?
 
  • #8
13
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thank you for the link, but none of those equations work, there is no time involved in the situation.
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
17
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thank you so much.
 

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