1. A person walks first at a constant speed of 7.00 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 3.00 m/s. What is her average speed over the entire trip? 2. The velocity of a particle moving along the x axis is given for t > 0 by v = (32.0t – 2.00t^3) m/s, where t is in s. What is the acceleration of the particle when (after t = 0) it achieves its maximum displacement in the positive x direction?