The position-versus-time graph shown below corresponds to an ant moving along the + x-direction. Various segments of the motion are identified the letters: A, B, C, D, and E. What the average velocity of the ant during the segment from D to E? D 40 30 20 position (m) B 10 C A 0 1 2 3 4 5 6 time S O - 15 m/s O + 10 m/s O + 15 m/s O - 10 m/s O - 40 m/s O + 40 m/s