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105. A pan with set of weights is attached with a light spring. When disturbed, the mass-spring system oscillates with a time period of 0.6 s. When some additional weights are added then time period is 0.7s. The extension caused by the additional weights is approximately given by

(a)   1.38 cm                                  (b)   3.5 cm

(c)   1.75 cm                                  (d)   2.45 cm

Answer-b

(39)

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