# 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?

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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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