Double your speed. (True/False)

  • Thread starter FAJISTE
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In summary: You know the relationship between the initial velocities, try to work it out from there..You can use this equation to find t, assuming the initial velocities are known.
  • #1
FAJISTE
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Homework Statement



Assume that the brakes in your car create a constant deceleration, independent of how fast you are driving. If you double your driving speed, which of the following statements are true?
Your stopping time will quadruple.
Your stopping time will not change.
Your stopping distance will double.
Your stopping time will double.
Your stopping distance will quadruple.
Your stopping distance will not change.

Homework Equations





The Attempt at a Solution



Well, mainly I'm not sure which formula to use, and I'm also confused cause I can't find one which contains speed. And I know velocity is different from that.

So maybe to start off with a formula? Thanks
 
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  • #2
FAJISTE said:
Well, mainly I'm not sure which formula to use, and I'm also confused cause I can't find one which contains speed. And I know velocity is different from that.

So maybe to start off with a formula? Thanks

You first! :wink:

What formulas do you know? :smile:
 
  • #3
Um, vf - vi = at

d = vi*t + 1/2at^2

vf^2 - vi^2 = 2ad
 
  • #4
I'd use the first one of those, if I were you and from that you can set up a ratio between t1 and t2 (;
 
  • #5
I'm guessing false for all of them but idno that's probably wrong
 
  • #6
Yeah i still don't get this
 
  • #7
If you start with the formula:

vf - vi = at

If you treat them as different cases you have:

vf1-vi1=a*t1
and
vf2-vi2=a*t2

You know the relationship between the initial velocities, try to work it out from there..
 
  • #8
FAJISTE said:
Um, vf - vi = at

d = vi*t + 1/2at^2

vf^2 - vi^2 = 2ad

For stopping time you need an equation with t in it.

For stopping distance you need an equation with d in it.

Let's start with the stopping time, t … how do you think t depends on vf?
 
  • #9
Well as the velocity increases, the time usually decreases, but isn't this different? Also this is due in 10 minutes lol
 
  • #10
FAJISTE said:
Well as the velocity increases, the time usually decreases, but isn't this different?

uhh? look at the equation … that's what equations are for! :smile:
 
  • #11
woo got it at the last second thanks haha
 

Related to Double your speed. (True/False)

1. Is it possible to double my speed?

Yes, it is possible to double your speed by increasing your physical abilities and practicing efficient techniques.

2. Does genetics play a role in doubling my speed?

Genetics can play a role in determining your natural speed potential, but it is not the sole factor. With proper training and techniques, you can still improve and potentially double your speed.

3. Can I double my speed overnight?

No, doubling your speed takes time, dedication, and consistent training. It is not a quick fix or an overnight process.

4. Do I need special equipment to double my speed?

No, you do not necessarily need special equipment to double your speed. However, certain equipment such as proper running shoes and resistance bands may aid in your speed training.

5. Can anyone double their speed?

It depends on individual factors such as genetics, current physical abilities, and dedication to training. While not everyone may be able to double their speed, most people can improve their speed through proper training and techniques.

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