Physics Help Forum Find Time and Distance

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Sep 18th 2010, 03:06 PM #1 Member   Join Date: Nov 2009 Posts: 94 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
 Sep 18th 2010, 03:21 PM #2 Member   Join Date: Nov 2009 Posts: 94 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.
 Sep 18th 2010, 05:54 PM #3 Senior Member   Join Date: Dec 2008 Location: Udupi, Karnataka, India Posts: 292 You are right.

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