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Homework Help: Object sliding down inclined plane

  1. Jul 7, 2004 #1
    An object slides down an inclined plane of angle 30 degrees and of incline length 4m. If the initial speed of the object is 5m/s directed down the incline, what is the speed at the bottom? Neglect friction.

    I used Kinitial+Uinitial=Kfinal+Ufinal. I got 2gh+5^2=v^2, but when I solve for v, I get 10.17m/s. What am I doing wrong?
     
  2. jcsd
  3. Jul 7, 2004 #2

    Doc Al

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    Staff: Mentor

    What did you use for h? h must be the vertical distance the object moves, not the distance along the incline.
     
  4. Jul 7, 2004 #3
    Should I use 4sin30 as my height?
     
  5. Jul 7, 2004 #4

    Doc Al

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    Staff: Mentor

    Yes. That's the height.
     
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