Question: A runner is jogging along and transitioned from running on hard cement to soft grass. How does surface compliance affect the runner's center of mass

A runner is jogging along and transitioned from running on hard cement to soft grass. How does surface compliance affect the runner's center of mass trajectory?
Group of answer choices
Softer surface = greater CoM oscillation amplitude
Softer surface = less CoM oscillation amplitude
Surface doesn't affect CoM oscillation amplitude

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