8-6. The motion of a particle moving in the horizontal direction as shown in Fig. P8.5 is described by its position x(t). Determine the position, velocity, and acceleration at t = 1.5 s if (a) x(t)=4 cos(5xt) m. (b) x(t)=43-61+71+2 m. (c) x(t) = 10 sin(10x1)+5e m.