Physics Help Forum Trying to find the displacement

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jul 5th 2017, 12:41 PM #1 Junior Member   Join Date: Jun 2017 Posts: 15 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.
 Jul 5th 2017, 01:48 PM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,299 Your formula is correct, though I get 35.41m. It applies to situations of constant acceleration.
 Jul 5th 2017, 03:19 PM #3 Junior Member   Join Date: Jun 2017 Posts: 15 great thanks very much

 Tags acceleration, displacement, find, speed, velocity

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