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Force transfer from compressed spring

  1. Jun 28, 2012 #1
    1. The problem statement, all variables and given/known data
    I have a metal spring 50mm in diameter 152 mm long compressed to half its length ie 76mm by using a weight of 50kg. I have used a clip to hold it compressed. When that clip is broken the spring will expand back to its original length of 152mm. How can I work out how far it will push a tennis ball weighing 1kg into the air and how long will this take ?


    2. Relevant equations
    Newton Acceleration = force/mass
    Speed = distance/time s=d/t
    acceleration= increase in speed over time (speed end -speed beg) / (time end-time beg)

    Please let me know what other equations I should use?


    3. The attempt at a solution
    The tennis ball will accelerate very fast to begin with at rate of 50kg - 1kg but slow as the force of gravity drags it back to the earth
     
  2. jcsd
  3. Jun 28, 2012 #2

    tiny-tim

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    Welcome to PF!

    Hi Neil! Welcome to PF! :wink:

    Use conservation of energy to find when the ball leaves the spring (that'll be when the acceleration = … ?)

    Then use one of the standard constant acceleration equations. :smile:
     
  4. Jun 28, 2012 #3
    A tennis ball of mass 1 kg? What is inside of it?
     
  5. Jun 28, 2012 #4

    tiny-tim

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    baked beans! :tongue2:
     
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