Answer:
Time period =0.49
Angular frequency =12.71
Explanation:
As this block is released from equilibrium position to a distance of 4.85 cm it's amplitude is 4.85 cm.
For a body which undergoes simple harmonic motion it's angular frequency =[tex]\sqrt{\frac{k}{m} }[/tex] =[tex]\sqrt{\frac{480}{3} }[/tex]=12.71
Time period of this block =[tex]\frac{2\pi }{angular frequency}=\frac{2\pi }{12.71}[/tex] =0.49 seconds