Answer:
a = -ω^2 A maximum acceleration
ω^2 = k / m angular frequency
E = 1/2 k A^2 maximum kinetic energy
a = k * A / m rewriting first equation
k = a * m / A = 5.2 * 6.5 / .948 = 35.6
E = 1/2 * 35.6 * .948^2 = 16.0 Joules
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