Some laboratory students are studying periodic motion using an oscillating mass on a spring. After recording data, they made the position versus time graph shown.

The function that represents the data on the graph may be written as

$x=$Acos$(t+),$ with $,in[0,2)$

If the mass is $3\mathrm{.}07$ kg $,$ then what is the spring constant, in newtons per meter?

$k=,\frac{N}{m}$

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