A spring has an unstretched length of $10\mathrm{.}0$ cm$.$ A $25$ g mass is hung from the spring, stretching it to a length of $15\mathrm{.}0$ cm$.$ Once you determine the spring constant, you replace the mass with one that weighs $75$ g$.$ If the mass is pulled down and released so that it oscillates, what will be the frequency of the oscillation?