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Homework Help: Simple physics 11 problem ?

  1. Dec 16, 2008 #1
    1. The problem statement, all variables and given/known data

    A 15.0 g object initially moving to the right at 30.0 cm/s collides with a stationary 45.0 g object. After the collision the 45.0 g object is moving to the right at 15 cm/s.
    what impulse does the 45.0 g object apply to the 15.0g object during collision?

    2. Relevant equations

    F[tex]\Delta[/tex]t = m[tex]\Delta[/tex]v

    3. The attempt at a solution

    I tried:
    F[tex]\Delta[/tex]t = m[tex]\Delta[/tex]v
    = (15.0g)(15.0cm/s)
    = 225 N x s
    but the answer is 6.75 x 10^-3 N x s
    help ?
  2. jcsd
  3. Dec 16, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    How did you determine the change in velocity of the 15.0g object?

    (Also: Use standard units. Convert g to kg; cm to m.)
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