Simple Harmonic Motion of spring

[hotspurslover]

Homework Statement

Mass is attached to a spring and set into a vibratory motion.

m=0.10 kg
f=2.5 Hz

Homework Equations

f=1/2pie{sqrt(k/m)}

The Attempt at a Solution

Trying to find k (force constant)

I tried using the equation above but I can't get the right answer.

answer: 25 N/m

 

[JHamm]

If $f = 2.5 Hz$ then $T = 0.4 s$ but we also know that $T = 2\pi \sqrt{\frac{m}{k}}$ so using that we can solve for k :)