The velocity of a particle moving along the x-axis is modeled by a differentiable function v, where the position is measured in meters, and the time I is measured in seconds. Selected values of (t) are given in the table below. The particle is at position x = 7 when I = 0 seconds. NC 0 8 20 25 32 40 1 (seconds) tv (t) (meters per second) 3 5 -10 -8 -4 7 a) Estimate the acceleration of the particle at 1 = 36 seconds. Show the computations that lead to your answer. Indicate units of measure. b) Using correct units, explain the meaning of v(e)dt in the context of the problem. Use a trapezoidal sum with the three subintervals indicated by the data to approximate Sa(tdt. c) For OSIS 40, must the particle change direction in any of the subintervals indicated by the data in the table? If so, identify the subintervals and explain your reasoning. If not, explain why not. d) Suppose the acceleration of the particle is positive for O