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Kinetic Energy After Some Time Has Elapsed

  1. Mar 16, 2016 #1
    A balla of mass 5 kg is dropped from a height of 10 meters. What is the kinetic energy after 1 second has elapsed?


    First i found the velocity using this equation V^2=2gh = 14m/s

    Then I used this equation to find Kinetic Energy KE=1/2mv^2 and got this 490 J.

    But i don't know how to find KE after 1 second elapsed. Can anyone help me?
     
  2. jcsd
  3. Mar 16, 2016 #2

    Doc Al

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    Staff: Mentor

    Hint: What's the acceleration due to gravity?
     
  4. Mar 16, 2016 #3
    That's the all information I have.
     
  5. Mar 16, 2016 #4

    Doc Al

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    The acceleration due to gravity is a constant. Check your book. (Hint: It's used in that equation you posted earlier.)
     
  6. Mar 16, 2016 #5
    oh right. You mean 9.81m/s^2.

    I used that to find Velocity? Was it wrong ?
     
  7. Mar 16, 2016 #6

    Doc Al

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    Yes, that's what I mean. Now use it to find velocity after 1 second.
     
  8. Mar 16, 2016 #7
    Oh thanks a lot.
     
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