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 chris215

 katieb
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
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 anonymous
use the formula D=RT
 anonymous
yes correct so you would divide what to get T by its self
 anonymous
hmmmm
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 anonymous
is that 7.5 minutes per second
 anonymous
oh ok
 anonymous
my best guess would be 6 seconds
 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
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
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
Now solve for t
 chris215
whats final and initial velocity thought
 Astrophysics
You should be able to figure that out, I actually posted it above.
 Astrophysics
The point of this problem is for you to figure out if you know all the quantities and what they mean.
 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
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
You have to convert the 108 km/h though to m/s
 Astrophysics
This is why I said we need to read it carefully earlier :P
 Astrophysics
Right on, now solve for t.
 Astrophysics
Yup 4s is good!
 Astrophysics
Np :)
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