1. The problem statement, all variables and given/known data Calculate the position vector at any given moment ( r(t) ) v(t)=(6t^2+4t)i+(3t-2)j+(12t^3-t^3)k m/s r(t=2)= (3,-0.5,-2) 2. Relevant equations r(t) = r0+ integral(v(t)) 3. The attempt at a solution I tried to integrate v(t) and get r(t) but I don't know how to calculate r0. what am I supposed to do with t=2 I was given? if I do integral of v(t) and calculate the it by t=2 - t=0, what would be the meaning of this? t=0 doesn;t have to give r(0)=(0,0,0) We learned to get the vectors with known starting points so I am puzzled about finding them myself and unfortunately all the questions deal with finding them -.- I seek to learn the meaning of the whole picture. then I can solve the rest.