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## Homework Statement

Astronauts in space cannot weigh themselves by standing on a bathroom scale. Instead, they determine their mass by oscillating on a large spring. Suppose an astronaut attaches one end of a large spring to her belt and the other end to a hook on the wall of the space capsule. A fellow astronaut then pulls her away from the wall and releases her. The spring's length as a function of time is shown in the figure

http://session.masteringphysics.com/problemAsset/1073872/3/knight_Figure_14_36.jpg

What is her mass if the spring constant is 240N/m

## Homework Equations

Hookes Law

F = -kx

U = (1/2)*k*x

^{2}

## The Attempt at a Solution

So the spring was pulled back 1.4 metres and then released where it went to the point 0.6

so 0.6 is the point at equilibrium, so -0.8 is the displacement and that is the x

F = (240 * 0.8)

and then im not sure what to do, im not even sure if im doing this right and help would be appreciated