A mass $m=1\mathrm{.}2kg$ is at the end of a horizontal spring of spring constant $k=75\frac{N}{m}$ on a frictionless horizontal surface. The block is pulled, stretching the spring a distance $A=7\mathrm{.}5cm$ from equilibrium, and released from rest.

Part $($a$)$

Write an equation for the angular frequency $$ of the oscillation in terms of the variables from the problem statement $($that is to say, just the symbols with no concern for their assigned values.$)$