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Homework Help: Collision of two objects

  1. Oct 23, 2005 #1

    I got this question, and I don't really know how to solve it, I'm stuck:

    A block of mass m = 2.80 kg slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 6.80 kg which is at rest on a horizontal surface, Fig. 7-41. (Assume a smooth transition at the bottom of the incline, an elastic collision, and ignore friction.)


    Determine the speeds of the two blocks after the collision.

    I worked out the length travelled down the slope using basic trigonometry and got a value of 7.2m, but now I am completely lost and don't know what the next step is...any help?

    Thanks a lot,

  2. jcsd
  3. Oct 23, 2005 #2


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    Science Advisor
    Homework Helper

    Start by finding the speed of the small block using energy conservation and go from there. :)
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