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Re: Skydiving question
The jolt is because the forces on your body have changed dramatically. Normally once you are in freefall (terminal velocity) your drag is equal and opposite to your weight. Once you open your parachute, the drag is increased vastly and so there is an overall force upwards until your speed slows down and drag equals weight again. However the force is not great enough to overcome the forces pulling you down (velocity, potential) so you only slow down. So you do get jerked back but you wont go back up, because at no stage does your speed drop to zero then increase upwards (relative to earth) thus you cant have travelled further upwards..
Okay that was waffle mixed with truth, but summing up. You only slow down when you open your parachute (which btw i think you just unravel it and the force of air opens it)
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