A mass weighing 4 pounds is attached to a spring whose constant is 2 lb/ft. The medium offers a damping force that is numerically equal to the instantaneous velocity. The mass is initially released from a point 1 foot above the equilibrium position with a downward velocity of ft/s. Determine the time (in s) at which the mass passes through the equilibrium position. (Use 9 = 32 ftfs2 for the acceleration due to gravity.) 5 Find the time (in s) after the mass passes through the equilibrium position at which the mass attains its extreme displacement from the equilibrium position. 5 What is the position (in ft) of the mass at this instant? ft