Amass of 0.40kg attached to a spring constant of 80nm is set into simple harmonic

Explanation:

If you are searching for the time period,

By the proof in the attachment you can derive the equation,

T =2π√(m/k)

Where

T = time period,

m = mass hung

k = spring constant

So you get T as, T = 0.44 s

If you are searching for frequency f,

f = 1/T = 2.25 Hz

this isn't the answer but they're the graphs