The radius of the pulley is and its moment of inertia is The mass and the spring constant is The cable does not slip relative to the pulley. The coordinate x measures the displacement of the mass relative to the position in which the spring is unstretched. Determine x as a function of time if and the system is released from rest with 21.47 For the system described in Problem 21.46, determine x as a function of time if and the system is released from rest with 21.48 For the system described in Problem 21.46, choose the value of c so that the system is critically damped, and determine x as a function of time if the system is released from rest with x