How do you find the force extended if given the amplitude? Is main questions, I also have one slight question. Ok, doing a problem. There is no damping. A (.15kg) object is hanging from a light(6.30N/m) spring. A sinusoidal force with an amp of 1.7 N drives the system. And the problem is asking at what frequency will the force make the object vibrate with an amp of .44m So I'm solving and my final equation is ω^2= w°^2 plus or minus (( Fext/m)/A) Where ω = natural frequency and ω°= frequency of the driving force. So my questions are how would I find the force extended given the amplitude and ω^2= w°^2 plus or minus (( Fext/m)/A(------ Would I plug in .44 for that A? Thanks in advance!