9. The data below in the table gives selected values of velocity, in meters per minute, of a particle moving along the x axis. The velocity function is differentiable overtime, t. Time min 0 3 5 9 11 15 Velocity -2 5 7 3 -2 -4 a) Is there a time during the interval [0, 15] minutes when the particle is at rest? b) Use the data from the table to approximate v'(7) and explain the meaning in terms of the motion of the particle at t = 7