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**What is the period of this motion: a mass M hanging vertically from a spring, of spring constant k, under the influence of gravity.**

**I figured:**

Mg-ky=Ma=Mw^2y

Mg-ky=Ma=Mw^2y

(w being angular freguency)

I know the solution(T=2pi * seqroot(M/k)) but how can I get there?? how can I eliminate Mg? Mg=k*ʌy equation leads to nowhere