11) What is the correct vertical velocity and vertical acceleration signals given the vertical position time trace of the foot below? 2 X Marker Position (m) A Vx (m/s) Ax (m/s) B Vx (m/s) Ax (m/s) O 2 20 0 -20 200 0 -200 20 -20 200 0 0 -200 0 0.2 0.2 0.2 0.4 0.2 0.4 0.6 0.2 Time (s) 0.6 0.8 0.4 0.4 0.6 Time (s) 0.6 0.8 0.8 0.8 0.4 0.6 0.8 Time (s) 1 C Vx (m/s) Ax (m/s) D Vx (m/s) Ax (m/s) 8 O 200 O 8 o 200 0 200 0 0.2 0.2 0.4 0.2 0.4 0.2 0.6 0.8 0.6 Time (s) 0.8 0.4 0.6 0.8 0.4 0.6 Time (s) 0.8 1