1. Not finding help here? Sign up for a free 30min 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!

Need help on this work energy question

  1. May 20, 2007 #1
    1. A car changes velocity from 25m/s to 8.0m/s. If the average force applied to the brakes is 16000N, how far does the 2300kg car go in this time?

    2. How much work is done if a 75kg runner speeds up from 1.2 m/s to 4.0m/s in 1.7s? How much extra work is done if there is a force of friction against the runner of 26N?
     
  2. jcsd
  3. May 21, 2007 #2
    Hey, moela, welcome aboard!

    You need to show work before we can help.
     
  4. May 21, 2007 #3
    You can start off by calculating what you can.
    For example if you know the mass and the speed what can you find out?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?