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 $($Figure $1).$

Part A

What is her mass if the spring constant is $\backslash (310\backslash$mathrm$\{$~N$\}/\backslash$mathrm$\{$m$\}\backslash )?$

Express your answer with the appropriate units.

Part B

What is her speed when the spring's length is $1\mathrm{.}2$ m $?$

Express your answer with the appropriate units.