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Old Sep 18th 2010, 03:06 PM   #1
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Smile Find Time and Distance

Hey There,
An electric car starts from rest and accelerates at a rate of 2.0 m/s^2 in a straight line until it reaches a speed of 20 m/s. The car then slows at a constant rate of 1.0 m/s until it stops.
a) how much time elapses from start to stop?
b) how far does the vehicle travel from start to stop?

So do I have:
Vo= 0 m.s
a = 2.0 m.s.s
V = 20 m/s
a when it slows 1.0 m.s
So do I do the calculates from start trip, then the 2nd half when it slows. So double the calculations correct?? Then just add the numbers together?

Thanks
bradycat is offline   Reply With Quote
Old Sep 18th 2010, 03:21 PM   #2
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Do I have the correct answers??

Time for first half of run 10 s and 20 s for 2nd part. So total time start to stop is 30 s.

Distance first half is 100 m and 200 m for 2nd part. So total distance is 300 m.

Do I have it correct??

I found time for start to the 20 m.s and then 20m.s to stop.
Same with time.
Added them both.
Let me know thanks.
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Old Sep 18th 2010, 05:54 PM   #3
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You are right.
sa-ri-ga-ma is offline   Reply With Quote
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