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Homework Help: Physics lab on energy need help

  1. Oct 10, 2013 #1
    Physics lab on energy need help!!

    1. The problem statement, all variables and given/known data

    Need to find velocity and time when I know all lengths/heights. Need to look at picture to fully understand my problem.

    2. Relevant equations

    Projectile motion equations... And velocity equations..

    3. The attempt at a solution
    On picture

    Attached Files:

  2. jcsd
  3. Oct 10, 2013 #2


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    Gold Member

    Since you know the height of the ramp, you know the potential energy which all gets converted into kinetic energy coming off the ramp. Since you know the kinetic energy, you know the velocity... since you know the velocity, and the height of the table, you know how far it will go before it hits the ground.
  4. Oct 11, 2013 #3
    Ok so my kinetic energy would be mass x 9.8 x .05 (height of ramp). Is this right? I don't know the mass though.
  5. Oct 11, 2013 #4


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    Staff: Mentor

    Maybe you'll get lucky and it will cancel or drop out of your solution. :wink:
  6. Oct 11, 2013 #5
    Okay so I came up with v^2= 2gh. 2 x 9.8 x .05 = .98 and the square root of .98 is .99. This is my velocity. Then to find my time do I divide my velocity by .75?
  7. Oct 11, 2013 #6


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    Gold Member

    no, the velocity is is in the x direction right? How fast will it accelerate towards the ground in the y direction?
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