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What is the spring constant of spring?

  1. Mar 4, 2012 #1
    1. The problem statement, all variables and given/known data
    A 60 kg person drops from rest a distance of 1.20 m to a platform of negligible mass supported by a stiff spring. The platform drops 6 cm before the person comes to rest. What is the spring constant of spring?

    2. Relevant equations

    3. The attempt at a solution





    the answer however is 4.12*10^5

    What am I doing wrong?

    Thank you
  2. jcsd
  3. Mar 4, 2012 #2


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    The mass falls further than 1.20 as the spring compresses.
  4. Mar 4, 2012 #3
    So would I add the 0.06m? Iam a bit confused
  5. Mar 4, 2012 #4


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    Correct. :smile:

    The question says …
    … after that it drops a further 0.06 m, so the total drop (for the person) is 1.26 m :wink:
  6. Mar 4, 2012 #5
    Thx Tim
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