11.4 A loaded railroad car is rolling at a constant velocity when it couples with spring and dashpot bumper system: After the coupling, the motion of the car is defined by the relation x 60e 4.81 sin ]6t, where x and are expressed in millimeters and seconds, respectively Deter- mine the position, the velocity, and the acceleration of the railroad car when (a) t = 0_ (b) t = 0.3
MM
Fig_ P11.4