A string has a mass of 120$120$ g and a length of 3.0$3\mathrm{.}0$ m.$.$ One end of the string is fixed to a lab stand and the other is attached to a spring with a spring constant of

ks =200$=200$ N/$/$m.$.$

The free end of the spring is attached to another lab pole. The tension in the string is maintained by the spring. The lab poles are separated by a distance that stretches the spring 2.00$2\mathrm{.}00$ cm.$.$ The string is plucked and a pulse travels along the string. What is the propagation speed of the pulse ($($in m/$/$s)?$)?$

 

  $/$$?$