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Homework Help: Mometum question

  1. Jan 18, 2010 #1
    1. The problem statement, all variables and given/known data

    A 56.2 gram tennis ball is loaded into a 1.27 kg homemade cannon. the cannon is at rest when it is ignited immediatly after the impulse of the explosion, a photo gate timer measures the cannon to recoil backwards a distance of 6.1 cm in 0.0218 seconds. determine the post explosion speed of the cannon and of the tennis ball

    2. Relevant equations

    i dont know equation

    3. The attempt at a solution

    confused can someone explain to me if they get this problem
  2. jcsd
  3. Jan 18, 2010 #2
    We get the problem but you haven't even bothered to say what equations are relevant.
  4. Jan 18, 2010 #3
    Sure you do--You would have already seen that equation by now in a general physics course, quite a few times by now. One of the first equations you are taught in intro physics class. What equation uses some of the information that you've already been given in your problem?? How is it written?? Show us that first and tell us what you get. If you don't know what equation to use for starters then how can we expect that you understand momentum/impulse? Show the equation, and tell us what you understand (or what you think you understand) about impulse and momentum.
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