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The natural angular frequency of a mass-spring system is 34/. At =0, the hanging mass is pulled down by 5.0cm and released. The equation of its oscillations at a function of time is
a. y = -[5.0cm]co(34)
b. y=[5.0cm](34)
c. y=-[5.0cm](34)
d. y=[5.0cm]co(34)