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Homework Help: Hw Help Please

  1. Nov 3, 2005 #1
    The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.024 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.054 kg and is initially at rest. After the collision, the two pucks fly apart with the angles 65 for a to the x axis, and37 for b to the x axis. A going up, B down.

    Find the final speed of
    (a) puck A and
    (b) puck B.

    I tired and tried and it dod not work out. the formula i am using has the 2 unknowns in it so it is impossible to solve. Breaking up into components i dont know how, what would the Vi of the speeds be and in what direction. This HW is due tomorrow and this is the first time i am stuck like this. Please help those who know how!

  2. jcsd
  3. Nov 3, 2005 #2
    you need to use the laws of conservation of momenteum and energy

    m1v1i + m2v2i = m1v1f + m2v2f


    1/2m1v1i^2 + 1/2m2v2i^2 = 1/2m1v1f^2 + 1/2m2v2f^2
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