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Homework Help: MOMENTUM and KE

  1. Apr 26, 2010 #1
    1. The problem statement, all variables and given/known data

    1. A blue puck with a mass of 0.0400 kg, sliding with a velocity of magnitude 0.200 ms-1 on a frictionless horizontal table, makes a perfectly elastic, head-on collision with a red puck with mass, m, initially at rest. After the collision, the velocity of the blue puck is 0.050 ms¯¹ in the same direction as its initial velocity.
    Find: a) the velocity (magnitude and direction) of the red puck after the collision
    and b) the mass, m, of the red puck.

    2. Relevant equations

    3. The attempt at a solution
    Ok so can someone please do this, i have and i got v=0.25m/s and m=0.024kg

    I know that this is meant to help and not give answers but i did it myself and just need some confirmation on the answer.
  2. jcsd
  3. Apr 27, 2010 #2


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    Homework Helper

    The result is correct.

  4. Apr 27, 2010 #3
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