Tendons are strong elastic fibers that attach muscles to bones. To a reasonable approximation, they obey Hooke's law. In laboratory tests on a particular tendon, it was found that, when a 246 g object was hung from it, the tendon stretched 1.23 cm. (answer in N/m)Find the force constant of this tendon in .

Because of its thickness, the maximum tension this tendon can support without rupturing is 135 N. By how much can the tendon stretch without rupturing, and how much energy is stored in it at that point? (answer in cm)

What is U? (answer in Joules)