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## Homework Statement

The force required to compress an imperfect horizontal spring an amount x is given by F = 150x + 12x^3, where x is in meters and F in newtons.

If the spring is compressed 2.5m, what speed will it give to a 3.5kg ball held against it and then released?

## Homework Equations

Not sure all these are relevant, but...

F = ma

a = dv/dt

K = mv^2 /2

## The Attempt at a Solution

I made many attempts and the computer told me that none were right.

Thanks!