You observe an object on a spring to oscillate with an

You observe an object on a spring to oscillate with an angular frequency of 4π radians per second, and to
reach a maximum displacement from its equilibrium point of 0.75 meters.
(a) What is the maximum velocity of the object?
(b) If the spring constant k = 150 N/m, what is the mass of the object?
(c) What is the speed of the object when it is displaced 0.20 meters from the equilibrium point?

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