How to find the Amplitude of a Horizontal Spring?

Liendal

New member
A spring has a k value of 120N/m and a .79kg mass stuck to the end of it. Striking it with a hammer gives the mass an initial speed of 2.72m/s. How do you find the Amplitude?

The Frequency I've discovered to be 1.962 HZ and w to be 12.324rad/s. But how do I find Amplitude? I tried the formula Force = fx, where Force = .79kg(9.8) and k = 120. But the resulting answer of .064516m was definetly incorrect
 
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