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Homework Help: The car

  1. Mar 6, 2006 #1
    This question; A car takes 3s to acclelerate from to 0 to 50 km/h. Assuming constant power output from the engines and ignoring air resistance, how long does it take to go from o to 100 Km/h?, has been bothering me. I orginally assumed I could use the basic kinamatic equations but the power output factor keeps throwing me off.

    Using power P=W/t but how dO i associate W with the speeds?
  2. jcsd
  3. Mar 6, 2006 #2


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    Gold Member

    You don't. It's a simple acceleration problem. It accelerates at a constant rate.
  4. Mar 6, 2006 #3


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    Science Advisor

    Assuming constant power output and ignoring all resistance, you will have constant acceleration. It will take twice as long to accelerate from 0 to 100 as from 0 to 50 km/h.
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