Mam if we stretch a rubber band and go on stretching and then release,its size increasesa little bit. it does not come to a normal size. So why do you say or any one other say that it comes to its normal size?

Dear student,
When you stretch a rubber band and then release it , it slightly increases it size but the increase is so negligible if the force applied is less. So , it is said that it regains its original shape.
But when you keep on stretching it , there will be a point where the rubber band will eventually breaks.

Regards.

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