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Homework Help: Two Elastic/Inelastic Questions - Really Easy

  1. Nov 16, 2005 #1
    A 6kg green ball with a speed of 2 m/s travels to the right and strikes a yellow ball of 3kg initially at rest. After the balls collide, the green ball continues to the right with a speed of 1 mls and the yellow ball moves to the right with a speed of 2 m/s Which of the statements is true?

    1, The type of collision cannot be determined from the information given.
    2. THe collision was totally inelastic.
    3. The collision was inelastic.

    I think it is 3 but I am not certain.

    An open cart on a level surface is rolling without fricitonal loss through a vertical downpour of rain. As the cart rolls, rainwater accumulates in the cart. The mass will:

    1. Decrease because of conservation of momentum.
    2. Decrease because of conservation of mechanical energy.
    3. Remain the same.

    I think it is 1.

    So you know - I am not cheating. I already did the quiz and got these questions wrong.
     
  2. jcsd
  3. Nov 17, 2005 #2
  4. Nov 18, 2005 #3

    daniel_i_l

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    None of the answers (1,2,3) look right in both of the problems.
     
  5. Nov 19, 2005 #4

    daniel_i_l

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    I meant in the second question.
     
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