A cylindrically shaped piece of collagen (a substance found in the body in connective tissue) is being stretched by a force that increases from 0 to 3.0 × 10-2 N. The length and radius of the collagen are, respectively, 2.5 and 0.091 cm, and Young's modulus is 3.1 × 106 N/m2.
(a) If the stretching obeys Hooke's law, what is the spring constant k for collagen?
(b) How much work is done by the variable force that stretches the collagen?

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3.0 kg 5.0 kg