question_answer

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 ONLINE 23-04-2013]

A) 15 cm

B) 12 cm

C)             16 cm

D) 10 cm