6. -1 points ZilDMEQModAp10 5.1.025. My Notes Ask Your Teacher A force of 2 pounds stretches a spring 1 fool. A mass weighing 3.2 pounds is allached to the spring, and the system is then immersed in a medium that offers a damping force numerically equal to 0.8 times the instantaneous velocity. (a) Find the equation of motion if the mass is initially released from rest from a point 1 fool above the equilibrium position. x(t)-(-cos(2t) - 2 sin (27)) it (b) Express the equation of motion in the form x(t) = Aext sin(√2-12+ ), which is given In (23) of Section 3.8. (Round to two decimal places.) x(t)= ft (c) Find the first time at which the mass passes through the equilibrium position heading upward. (Round your answer to three decimal places.) 2.912