The frequency `f` of vibrations of a mass `m` suspended from a spring of spring constant `k` is given by `f = Cm^(x) k^(y)` , where `C` is a dimensionnless constant. The values of `x and y` are, respectively,
A. `x=1/2,y=1/2`
B. `x=-1/2,y=-1/2`
C. `x=1/2,y=-1/2`
D. `x=-1/2,y=1/2`
