Extracted text: 11.4 The motion of a particle is defined by the relation x = 6t - 8+ 40 cos rt, where r and t are expressed in inches and seconds, respectively. Determine the position, the velocity, and the accelera- tion when t 6 s. 11.5 The motion of a particle is defined by the relation x 6 - 21- 121 + 3t + 3, where r and t are expressed in meters and seconds, respectively. Determine the time, the position, and the velocity when a = 0. 11.6 The motion of a particle is defined by the relation x= 2 - 15 + 24t + 4, where x is expressed in meters and t in seconds. Deter- mine (a) when the velocity is zero, (b) the position and the total distance traveled when the acceleration is zero.