physics

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A certain spring elongates 9 mm when it is suspended vertically and a block of mass M is hung on it. The natural frequency of this mass-spring system is:
a)0.014
b)5.3Hz
c)31.8Hz
d)181.7Hz
e)need to know M
please explain the answer....and hope to answer soon.... thanks in advance

  • physics -

    no idea

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