A block of mass m = 2 kg is attached to a spring with spring constant k = 20 N/m. The block was pulled a distance A = 5 cm from equilibrium along the positive x axis. Now solve the following problems. (a)  Find the total energy of the system. (b)  Find the velocity, acceleration and the angular frequency of the block when t = 2s. Also indicate their directions. (c)  Show that at any time t, the total energy of the system is conserved

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