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Old Jul 5th 2017, 01:41 PM   #1
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Trying to find the displacement

Hi,
I'm hoping to get some clarification on this. I'd like to see if I did it right, and if not then I'd really like to know what I did wrong.
A car is traveling at 20.83m/s , it takes 3.4s to stop, what is the displacement?

d=1/2(V1+V2)t

= 1/2(20.83m/s+0m/s)(3.4)
= 1/2(70.83)
= 35.42m

It seems right, but in my lesson text they say that formula only applies to situations of constant velocity, and I don't believe this is constant velocity.

I appreciate any help, thanks very much.
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Old Jul 5th 2017, 02:48 PM   #2
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Your formula is correct, though I get 35.41m. It applies to situations of constant acceleration.
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Old Jul 5th 2017, 04:19 PM   #3
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great thanks very much
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