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Speed of an object on a ramp.

  1. Nov 4, 2007 #1
    1. The problem statement, all variables and given/known data
    A block starts from rest at a heigh of 8m on a fixed inclined plane. The acceleration of gravity is 9.8m/s^2. What is the speed of the block at the bottom of the ramp? Answer in units of m/s.

    Block mass = 4.5kg
    coefficient of friction = 0.19
    Angle of incline = 29 degrees
    Distance from block to end of ramp = 8m


    2. Relevant equations



    3. The attempt at a solution

    using a = (sin(theta)-ucos(theta)g I got 3.122 for a. However i'm not sure how to get a final velocity for the block from just the acceleration and distance.
     
  2. jcsd
  3. Nov 4, 2007 #2

    learningphysics

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    Homework Helper

    There's a kinematics equation that will directly give you the final velocity v2.

    You know v1, a and d... you need v2... which equation will let you get it?
     
  4. Nov 4, 2007 #3
    that would be sqrt of 2ax since vi is 0, but that answer comes out to 7.068 which is wrong so i must have my acceleration wrong
     
  5. Nov 4, 2007 #4

    learningphysics

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    your acceleration looks right to me.

    Did you use the right distance?

    They give the height as 8m. But what is the length of the incline?
     
  6. Nov 4, 2007 #5
    oh man i'm such an idiot. That would be the problem.
     
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