A student is trying to launch a $40g$ ball using a spring. This spring is initially compressed

$0\mathrm{.}05m$ with a spring constant of $20n{m}^{-1}.$ When the student releases the spring, what is the

velocity of the ball when it leaves the spring? Make sure to round to $2$ decimal places.

$v_{\text{f}\text{i}\text{n}\text{a}\text{l}}=?$