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At t=0, a mass oscillating on a spring with spring constant 12 N/m is observed to have a velocity of 12 m/s and displacement -4.0 m. The total energy of this oscillator is 150J. Assuming that the position of the mass is given by x(t) = Acos(ωt +Φ), find numerical values for:

a) the mass

b) A

c) ω

d) Φ

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