chris215
  • chris215
-
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
use the formula D=RT
anonymous
  • anonymous
yes correct so you would divide what to get T by its self
anonymous
  • anonymous
hmmmm

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anonymous
  • anonymous
is that -7.5 minutes per second
anonymous
  • anonymous
oh ok
anonymous
  • anonymous
my best guess would be 6 seconds
anonymous
  • anonymous
what i would do is use the formula that i showed you and plug in the numbers but just to make sure im not giving you the wrong answer im going to have my friend help you @Elsa213
Astrophysics
  • Astrophysics
A car moving with a speed of 108 km/h is brought to rest in a distance of 60 m. The car's acceleration is -7.5 m/s/s. How much time did the car take to stop? So the initial velocity of the car is 108 km/h and it's brought to rest in a distance of 60m and the cars acceleration is -7.5 m/s^2 t = ? Now we have the formula \[d= v_0 t + 1/2 at^2\] now put it together.
Astrophysics
  • Astrophysics
No it doesn't, but this formula may be a bit too difficult for you atm as you would have to use quadratic formula, lets just make it simple on ourselves and use \[v_f = v_i + at\]
Astrophysics
  • Astrophysics
Now solve for t
chris215
  • chris215
whats final and initial velocity thought
Astrophysics
  • Astrophysics
You should be able to figure that out, I actually posted it above.
Astrophysics
  • Astrophysics
The point of this problem is for you to figure out if you know all the quantities and what they mean.
Astrophysics
  • Astrophysics
Try setting it up, make sure you solve for t, and note that you have to convert your units to m/s!! Try it out and if you get it wrong, don't worry I will help you then.
Astrophysics
  • Astrophysics
Ok, so reading this question `A car moving with a speed of 108 km/h is brought to rest in a distance of 60 m.` Notice how it says the car is brought to REST in a distance of 60m, so it's final velocity = 0, as it's at rest, and initial is 108 km/h.
Astrophysics
  • Astrophysics
You have to convert the 108 km/h though to m/s
Astrophysics
  • Astrophysics
This is why I said we need to read it carefully earlier :P
Astrophysics
  • Astrophysics
Right on, now solve for t.
Astrophysics
  • Astrophysics
Yup 4s is good!
Astrophysics
  • Astrophysics
Np :)

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