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?
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.