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**Homework Statement**

A spring is stretched 2m by a mass of 2 kg. The body is immersed in a viscous fluid with the damping coefficient having 4 Ns / m which is driven by an external force 4cos (2t). Plot mass position versus time. g = 10 m / s2.

**The attempt at a solution**

I know first I have to find an equivalent form as that of forced oscilations

x

^{⋅⋅}+2γx

^{⋅}+ω

_{0}

^{2}x = F×cos(ωt)/m

but I can't figure out because I don't have an elasticity const

**k**or a frequency. I think I don't need one, but I don't know how to start.