Particle moves along the x-axis so that its velocity at time t greater or equal to 0 is given by

Graph shown for 0 to sqrt(5pi). Position of the particle @ time t is x(t) and its position at time t = 0 is x(0) = 5

a) Find the acceleration of the particle at the time t = 3

I got the answer as 0.. IS this right??

The other ones I don't get,,,

b) Find the total distance traveled by the particle from time t = 0 to t= 3..

Do I take the integral of

??? from 0 to 3??

c) FInd the postion of the particle at time t = 3

d) for 0 to sqrt(5pi) with t in between.. find the time t at which the particle is farthest to the right. Explain your answer.