Spring Physics

A block of mass 3 kg is hung from a spring, causing it to stretch 9 cm at equilibrium. The 3 kg block is then replaced by a 4 kg block, and the new block is released from the position shown below, at which point the spring is unstretched.WHAT IS THE LENGTH OF THE SPRING AT EQUILIBRIUM?

Please help me on this question I am beyond desperate!!!!

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  1. It's ok Jennifer. No need to shout.
    F = kx
    3(9.8) = k(.09)
    Solve for k and redo Hooke's
    4(9.8) = kx
    solve for x

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    posted by Chanz

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