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Momentum questions

  1. Jun 13, 2013 #1
    1. The problem statement, all variables and given/known data
    A pellet is fired from a gun. the Pellet is fired horizontally into the a toy car, which has modelling clay attached to it. The pellet remains in the clay as the car moves.

    The car travels a distance of 0.069M before coming to a rest at 1.3s

    show that the speed of the car immediately after being struck by the pellet was about 1 m/s

    2. Relevant equations

    No idea, but it also asks in part 2, the assumption you made in order to apply the equation.

    3. The attempt at a solution

    my attempt was using the kinematic equations but I reached a value of 0.1 m/s which is no where near 1m/s
  2. jcsd
  3. Jun 13, 2013 #2


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    using the kinematic equations is the correct approach. I also get your answer. Could be a typo in the book answer.
  4. Jun 13, 2013 #3
    It cannot be, the value is way off.
  5. Jun 13, 2013 #4
    Never mind, you are indeed correct and I apologise, I just realised I read the value for distance differently, the kinematic equations gave a value of 1.06m/s which is good enough for me.

    However now I have to state an assumption in order to apply the equation I used.
  6. Jun 14, 2013 #5


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    The usual assumptions about under what conditions momentum is considered, you might think of others.
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