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Homework Help: Slide and Collide.

  1. Nov 24, 2007 #1
    [SOLVED] Slide and Collide.

    I need help getting started on this.

    A block of mass 12 kg lies at a vertical height 7.3 m on a frictionless incline plane. It slides down the plane and collides elastically with a second block whose mass is 6.8 kg. Find the final velocities of the two blocks.

    so far I got:
    (1/2)M1V1^2 = (1/2)M1V2 ^2 + (1/2)M

    V2 = ((M1V1^2) - (M1V1^2))/M2.

    I am not sure where to start.
  2. jcsd
  3. Nov 24, 2007 #2

    And also use conservation of momentum

  4. Nov 24, 2007 #3
    So the initial velocity of M1 at the top is zero right?
    Do I need to get the the velocity while the mass is sliding down the incline?
    If so, I will need to calculate the x direction, and then use the same velocity sliding down the incline as the initial velocity until it collides right?
  5. Nov 24, 2007 #4
    In this question nothing extra is given,so we can use just

  6. Nov 24, 2007 #5
    Thanks, for the final equation, I got:

    Vbf - Vaf = -(Vbi - Vai)

    Is that right?
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