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Edit question An object with mass 0.220 kg is acted on by an elastic restoring force...

Edit question An object with mass 0.220 kg is acted on by an elastic restoring force with force constant 10.5 N/m. The object is set into oscillation with an initial potential energy of 0.150 J and an initial kinetic energy of 5.60×10−2 J.

From the problem (a), (b), and (c) I got

Amplitude 0.198m

Potential energy when the displacement was at half 5.15*10^-2 J

Displacement when Potential energy and Kinetic energies are equal 0.140m And I don't know

(d) What is the value of the phase angle ϕ if the initial velocity is positive and the initial displacement is negative?

Now I got 2.356 rad for the (d) but I can't sure

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