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Energy (perfectly elastic)

  1. Apr 6, 2013 #1
    A 100gram block is attached to the end of a spring on a frictionless table that has a spring constant of 20N/m. The other end of the spring is attached to the wall. A 20g ball is thrown at the block with a velocity of 5.0m/s.

    If the collision is perfectly elastic, what is the ball's speed immediately after the collision.

    I am unsure about how to solve this, I know that an elastic collision is one in which energy is conserved so the initial Kinetic energy of the ball is the systems total energy after collision. But what to do from there?

    PS: answer in book says 3.3m/s
  2. jcsd
  3. Apr 6, 2013 #2


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    2017 Award

    Staff: Mentor

    Add momentum conservation, write down formulas and solve.
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