Qmar G Question 4, 3.4.15 HW Score: 20%, 1 of 5 points Part 1 of 4 O Points: 0 of 1 ds The accompanying figure shows the velocity v = dt " = f(t) (m / sec) of a body moving along a coordinate line. The body reverses direction at t = (Use a comma to separate answers as needed.) a. When does the body reverse direction? b. When is it moving at a constant speed? c. Graph the body's speed for 0 st= 10. d. Graph the acceleration, where defined Av (m/sec) = [(1) (sec) 0