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## Homework Statement

A 0.65-kg mass is hanging from a spring with spring constant 15 N/m. Then the mass is displaced from the equilibrium by 2 cm and let go.

## Homework Equations

angular frequency:ω=2∏/T

## The Attempt at a Solution

I found T: 2∏sqrtm/k, 2∏sqrt0.02/15N/m= 0.229429488s

ω=2∏/0.229429488s=27.39rad/s

I got the answer wrong but the units are suppose to be in rad/s. I feel like 0.65kg plays a role in the equation, but don't know where to place it. Where exactly did I go wrong.