The potential energy of the harmonic oscillator is "U = \\frac{m \\omega^2 x^2}{2}", and total energy is "E = T + U = \\frac{m \\omega^2 A^2}{2}", where "A" is the amplitude, "m" is the mass, "\\omega" is the angular frequency. .
At "x = 0.3 m", the kinetic energy is "T = \\frac{U}{2}", so at that moment "E = \\frac{U}{2} + U = \\frac{3 U}{2} = \\frac{3}{2} \\frac{m \\omega^2 x^2}{2}", and according to the previous equation "E = \\frac{m \\omega^2 A^2}{2}". Hence, at "x = 0.3", "\\frac{3}{2} \\frac{m \\omega^2 x^2}{2} = \\frac{m \\omega^2 A^2}{2}", from where "A^2 = \\frac{3 x^2}{2}" and "A = \\sqrt{\\frac{3}{2}}x \\approx 0.37 m".
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