58. The position of a particle moving on x-axis is given by  x = , withxin meters andtin seconds. Whichstatement in the following is correct?
(A) The particle is moving in the positive direction ofxwith a speed of1.5m/satt =1.0 s.
(B) The acceleration of the particle at t = 1.0 s is -0.50 m / s2.
(C) The acceleration of the particle is constant.
(D) The particle is moving in the negative direction ofxwith a speed of0.50m/satt =1.0 s.
(E) The velocity of the particle is constant.