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Homework Help: Momentum change

  1. Feb 29, 2004 #1
    i need help for this question. i don't know if i got it right or wrong:

    a compact car and a large truck collide head on and stick together. which undergoes the larger momentum change?

    i thought the answer is "can't tell without knowing the final velocity of the combined masses." Am i correct?
     
  2. jcsd
  3. Feb 29, 2004 #2

    Doc Al

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    Staff: Mentor

    No. Total momentum is conserved during the collision. Think about what that means.
     
  4. Mar 1, 2004 #3
    thanks Doc

    That means both of them undergone same momentum change. If I am wrong, please let me know. Thanks again, Doc
     
  5. Mar 1, 2004 #4

    Doc Al

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    Staff: Mentor

    Re: thanks Doc

    Each undergoes the same magnitude of momentum change. (The changes are equal and opposite, of course.)
     
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