Tension is maintained in a string as in the figure below. The observed wave speed is $v=17\mathrm{.}0\frac{m}{s}$ when the suspended mass is $m=3\mathrm{.}00kg.$

$($a$)$ What is the mass per unit length of the string?

$k\frac{g}{m}$

$($b$)$ What is the wave speed when the suspended mass is $m=2\mathrm{.}30kg?$

$\frac{m}{s}$