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Speed and displacement. please help!

  1. Oct 14, 2007 #1
    A glider with mass m= 0.230 kg sits on a frictionless horizontal air track, connected to a spring with force constant k= 5.40 N/m. You pull on the glider, stretching the spring 0.100 m, and then release it with no initial velocity. The glider begins to move back toward its equilibrium position (x=0).

    What is the speed of the glider when it returns to ?

    What must the initial displacement of the glider be if its maximum speed in the subsequent motion is to be 2.10 ?

    For the first part I thought to use the formula K1+U1=K2+U2 and i came up with 0=.115v^2-.27 and found v = 1.53 m/s but that isnt right. Can someone please help me?

    3. The attempt at a solution
  2. jcsd
  3. Oct 14, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Double check your calculation for 0.27.
  4. Oct 14, 2007 #3
    hahaha thanks. no wonder why i got it wrong. Such a silly mistake.

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