Simple Harmonic motion calculation for a mass on a spring

[Jshu]

Homework Statement

A 1.6 kg mass attached to a spring undergoes simple harmonic motion of amplitude 0.12 m and has an energy of 72 J

Relevant Equations

E=(1/2)(k)(x^2)+(1/2)(m)(v^2)
T=2pi sqrt{m/k}

Im not sure how to find k if I'm not given a force or period.

 

[TSny]

Is there some position of the mass where you know both x and v?

 

[BvU]

Hi, !

Your problem statement is severely incomplete
And PF rules require an effort on your part