5. Find the length of the curve r(t) = (2cost, 2sint, ( 5 ) over the interval re [0, ] . Clearly provide your length integral and give exact answer. 6. The velocity vector of an object is known as: 1/ = (4e" , 3e' ). Initially, when r = 0, the object is located at "(0) =(2, 0). Find the position vector r(t) of this object