A block with a mass of 0.357 kg is attached to a spring of spring constant 599 N/m. It is sitting at equilibrium. You then pull the block down 4.80 cm from equilibrium and let go. What is the amplitude of the oscillation?

I know A=D/F... I keep getting the wrong answer though. I even made sure to convert my answer. Please help!
Thanks

you are overthinking this.

Amplitude=4.8cm