1. A spring is compressed 5 in. from its equilibrium position. If the spring modulus k is 10 lbf /in. of deflection, how much work was done in foot-pounds to deflect the spring?
2. A spring is deflected by a weight a distance of 100 mm. If the modulus of the spring is 100 N/m, what is the mass that was placed on the spring?
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