A loaded railroad car is rolling at a constant velocity when it couples with a spring and

Question:

A loaded railroad car is rolling at a constant velocity when it couples with a spring and dashpot bumper system. After the coupling, the motion of the car is defined by the relation x = 60e-4.8t sin16t where x and t are expressed in mm and seconds, respectively. Determine the position, the velocity and the acceleration of the railroad car when
(a) t = 0,
(b) t = 0.3 s.