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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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