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!

Work Done Car Uphill PE and KE

  1. Apr 16, 2013 #1
    if a car of mass 980kg accelerates up an incline (10°to the horizontal) and increases its speed from 8.3m/s to 13.8m/s in 60m, both the air resistance and rolling resistance are taken as constant at 50N and 200N respectivelyfor the acceleration period described, determine work done

    work done = Δkinetic energy + Potential energy

    kinetic energy = 1/2 * mass * (v22-v12)
    PE = mgh

    work done = 1/2 * 980 * (13.82-8.32) + 980 * 9.81 * 60sin(10) + 50N + 200N = 161KJ

    but I have the answer to be 175KJ
     
  2. jcsd
  3. Apr 16, 2013 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi MMCS! :smile:
    Anything strike you as odd about those units? :wink:
     
  4. Apr 16, 2013 #3
    Ah of course, multiply these forces by the the distance to get units of Nm. Thanks tiny-tim!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Work Done Car Uphill PE and KE
  1. KE and PE Work (Replies: 4)

  2. Work/KE/PE problem (Replies: 1)

  3. KE And PE and Work? (Replies: 17)

Loading...