Problem Solved

"A plumb with mass = 1,0 kg hanging in a spring with springstiffness k = 1,5 N/m. We give the plumb a speed v = 2,0 m/s after draging it 1,0 m down from balance/equilibration-possition. The frictioncoefficient l = 0,5 kg/s."

Newtons 2. lov gives:

mg-k(so+s) - lv = ma

--> S``+(l/m)S`+k*S= 0

Find fluctuation/svingning/S as a function of the time t.

a) The speed has direction down.

b) The speed has direction up.

In a) Shal I put 2,0m/s innstead for S` ? and then solve the Function?

And i b) Shal i put -2,0m/s instead for S`and then solv the function? I don't have any answer i can look at, and chek if that's right :/