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!

Finding Kinetic energy

  1. Mar 27, 2014 #1
    1. The problem statement, all variables and given/known data

    If the velocity of a rocket is 10 meters per second and its mass is 10 kg, its kinetic energy is:

    a. 5000 joules
    b. 500 joules
    c. 10000 joules
    d. 1000 joules


    2. Relevant equations[/b)

    Ek= (1/2) mv2

    3. The attempt at a solution

    e=(.5)10x10(2)
    E=5000 j
     
  2. jcsd
  3. Mar 27, 2014 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Good. I assume you mean: Ek= (1/2) mv2

    Check your arithmetic.
     
  4. Mar 27, 2014 #3
    Thank you, I appreciate that. Im having a hard time figuring out how to put in the right formulas for this site.

    But doing it again, I got 500 j. That right?
     
  5. Mar 27, 2014 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Yep! :thumbs:
     
  6. Mar 27, 2014 #5
    Except that the unit symbol must be J - not j.
     
  7. Mar 27, 2014 #6

    berkeman

    User Avatar

    Staff: Mentor

    There is an entry in the PF FAQ thread (in the Feedback forum) that describes how to write the mathematical equations here:

    https://www.physicsforums.com/showthread.php?t=617567

    :smile:
     
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: Finding Kinetic energy
Loading...