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2) The following figure describes the displacement, as a function of time, for a (T) -2 kg mass connected to a massless spring, and under frictionless circumstances sliding horizontally. Although the vertical axis plots the horizontal displacement of the mass, the axis shows nok vertical scale. At t = 1 sec, the mass has a kinetic energy which is 2 J. Do examine the figure, it contains important information! 0 2 LS a) Determine the angular frequency of this oscillation b) Determine the spring constant of the spring. c) If the motion is described by x = Asin (wt ), where A is positive, determine the phase constant φ. d) What is the amplitude of this motion (Note that there is no vertical scale given)?

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