Two springs of constant ${k_1}$and ${k_2}$are joined in series. The effective spring constant of the combination is given by
  • A$\sqrt {{k_1}{k_2}} $
  • B$({k_1} + {k_2})/2$
  • C${k_1} + {k_2}$
  • D${k_1}{k_2}/({k_1} + {k_2})$
AIPMT 2004, Easy
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