A 05-Kg Mass Is Suspended from a Massless Spring That Has

Multiple Choice

A 0.5-kg mass is suspended from a massless spring that has a force constant of 79 N/m.The mass is displaced 0.1m down from its equilibrium position and released.If the downward direction is negative,the displacement of the mass as a function of time is given by

A) y = 0.1 cos(158t - $\pi$ )
B) y = 0.2 cos(158t - $\pi$ )
C) y = 0.1 cos(12.6t - $\pi$ )
D) y = 0.2 cos(12.6t + $\pi$ )
E) y = 0.1 cos(2t + $\pi$ )