The tension in a ligament in the human knee is approximately proportional to the extension of the

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The tension in a ligament in the human knee is approximately proportional to the extension of the ligament, if the extension is not too large. If a particular ligament has an effective spring constant of 150 N/mm as it is stretched, 

(a) what is the tension in this ligament when it is stretched by 0.75 cm? 

(b) What is the elastic energy stored in the ligament when stretched by this amount?

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