Calculate effective spring constant, Physics

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Calculate effective spring constant

An elastic cord has an unstreched length of 8.1 m and a cross-section of 2 cm^2. If the Young's Modulus of the material is made from is 310 MN/m^2 what is the effective spring constant of the cord for stresses and strains where Young's Modulus is valid?

a) 6.2e+4 N/m

b) 1.31e-6 m/N

c) 7.65 kN/m

d) 765 kN/m

e) 0.000131 m/N

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Physics: Calculate effective spring constant

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Physics: Calculate effective spring constant

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