- #1

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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 .

What is her mass if the spring constant is 240 ?

What is her speed when the spring's length is 1.2 ?

## Homework Equations

image is http://session.masteringphysics.com/problemAsset/1001073/9/knight_Figure_14_36.jpg

## The Attempt at a Solution

i got that the answer to the first question is 54.7kg

i just don't know how to find her velocity at that length

if someone can please help me