Spring constant physics?

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What is the spring constant of Spring 1, in N/m?

This is in an online lab. All I know about spring 1 is that it is 30cm long, and with a mass of 250g attached, it reaches 55cm long.

My answer of 4.5 (.25 * 10 = k * .55) is incorrect...why? Thank you!

  • Spring constant physics? -

    Got it - I wasn't taking the magnitude of displacement :)

  • Spring constant physics? -

    Newtons is force ... like m g

    m g = k x

    .25 kg * 9.8 = k * .25 m

  • Spring constant physics? -

    m g = F = k x = k(.55-.30)
    .25(9.81) = k (.25)
    k = g = 9.81 N/m

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