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## Homework Statement

The fastest recorded skydive was by an Air Force officer who jumped from a helium balloon at an elevation of 103000 ft, three times higher than airliners fly. Because the density of air is so small at these altitudes, he reached a speed of 614 mph at an elevation of 90000 ft, then gradually slowed as the air became more dense. Assume that he fell in the spread-eagle position and that his low-altitude terminal speed is 125 mph. Use this information to determine the density of air at 90000 ft.

## Homework Equations

V=sqrt(4W/pA) w= weight, p=coefficent, a = area ... D=.25pv^2A

## The Attempt at a Solution

no idea what to do...