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A body of mass 'm' is tied to one end of a spring and whirled round in a horizontal plane with a constant angular velocity. The elongation in the spring is 1 cm. If the angular velocity is doubled, elongation in the spring is 5 cm. The original length of the spring is:     JEE Main Online Paper ( Held On 23  April 2013 )

A) 15 cm                 

B) 12 cm

C) 16 cm                 

D) 10 cm