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If the original length is L = 1.0 m, what will be the change in length of the rubber tube when the ball is revolving?

It was given as a hint that centripetal force is equal to elastic force:

F_c=mass *length*omega^2,

where length is now the stretched length, that is,

length= L+delta L.

The elastic force is equal to

F_el=k*delta L.

first, I found k to be 50. but I plugged in k to the above equation and tried to find delta L. as .002 , but it's incorrect, hints?