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as the weight held by a spring increases, the length of the spring increases proportionally. Suppose a 2-lb weight stretches a spring to 15 in., and a 12-lb weight stretches the same spring to 20 in. What is the length of the spring with no weight attached?

  • Physics - ,

    (20-x)/(15-x) = 12/2 = 6
    90 - 6x = 20 - x
    5x = 70
    x = 14 inches

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