Amplitude Question Just Need A Formula

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The discussion focuses on calculating the amplitude of a mass-spring system where a 730 g mass is initially struck, giving it a speed of 2.74 m/s. The spring constant is specified as k = 128 N/m. To find the amplitude, users are encouraged to apply the formula derived from energy conservation principles, specifically using the kinetic energy at the initial speed and the potential energy stored in the spring at maximum displacement. The forum emphasizes the importance of showing work to receive assistance.

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At t = 0, a 730 g mass at rest on the end of a horizontal spring (k = 128 N/m) is struck by a hammer, which gives it an initial speed of 2.74 m/s.
(a) Determine the period of the motion.
s
Determine the frequency of the motion.
Hz
(b) Determine the amplitude.
m

I have found parts A with no problem...but i was hoping someone could post the formula that I can use to find the amplitude as I am having some real trouble figuing it out.
 
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Please show some work. You won't get help until you do, according to the forum guidelines. (I don't mean to be rude, but it's the only way we can be sure the person asking for help doesn't just want someone else to do their homework.)
 
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