A student is observing the oscillations of a mass on the end ofa spring.  The spring has a force constant of 6 x10-5N/m, and the mass is 0.15 kg.  She pullsit 6 cm below equilibrium and lets it go.  She nowwrites an equation which she believes describes the motion of themass. In her description, the y axis is vertical, and UP ispositive.  Her equation is  Â
y = (3 cm) sin ( 0.02 sec-1 t  + 3.14)
   (A) Does she have the amplituderight?  If not, what was right? If yes, explain.
   (B) Does she have the frequencyright?  If not, what was right? If yes, explain.
   (C) Does she have the phase angle right? If not,what was right? If yes, explain.
