1. Let a, b E R with a 0 for all te (a, b) and that lly'(t)|| is not constant. Then N(t) and y"(t) are not parallel. (1b) Suppose [a, b] = [0, 6]. If y(t) is the position of a particle at t seconds, then lly(4)-y(2)|| is the distance the particle travels between 2 and 4 seconds