The Graph below represents the velocity of a particle moving on a horizontal line on the interval [0,e]. y YA C d answer. u(t) e f a. On what interval(s) is the particle moving to the left? b. When is the particle at rest? Justify your X d. On what interval(s) does the particle accelerate? Justify your answer. c. When does the particle change direction from right to left? Justify your answer.