At time t, the position of a body moving along the s-axis is s= -t° + 15t - 72t m. a. Find the body's acceleration each time the velocity is zero b. Find the body's speed each time the acceleration is zero c. Find the total distance traveled by the body from t=0 to t= 5. a. What is the body's acceleration each time the velocity is zero? Select the correct choice below and, if necessary, fill in the answer box to complete your choic OA. m/s2 (Simplify your answer. Use a comma to separate answers as needed.) OB. There is no solution.