Question

18 which best explains why we are able to accelerate forward when starting to run? a as one leg moves backward, it provides an equal and opposite force for the other foot to move forward. b the foot not touching the ground propels the entire body as it swings forward. c no acceleration takes place. the runner has a constant velocity. d the striking foot pushes backward against the ground. the friction provides an equal and opposite force forward.

Explanation:

Answer:

D. The striking foot pushes backward against the ground. The friction provides an equal and opposite force forward.