In this video there is a large amount of people sky diving in formation. You can see that the people control their speed by changing their surface area. When the people broke away from formation you could see that they all made their surface area smaller in order to go somewhere else. This is because the larger your surface area is the slower that you are going to go. It was also clear that when the person taking the video was about to deploy his parachute he reached a terminal velocity and then after he had deployed his parachute his acceleration increased negatively, his velocity decreased, and his net force increased. This all happens because his parachute adds to his surface area making him slow down.
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