(4) (5 pts) A particle with velocity v(t) = = + 8 , for t > 0, in m/s, moves in a straight line. Its initial displacement is known to be s(1) = 4 , in m. Find the position function s(t) along with units. Simplify so that your final answer does not contain an integral. Write units for full credit. s (t) = (5) (8 pts) Use substitution to fully evaluate the integral. Write out the details of the substitution for full credit. Showing all necessary steps is required for full credit. 3x2. ( 423 - 5) 'dx =