1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Gold Member

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


    User Avatar
    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook