Hey guys, i seem to be stuck on this problem online: The fastest recorded skydiv

Question

Hey guys, i seem to be stuck on this problem online:

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

I do not know how to do this problem without his mass or area. Idont know what im doing wrong. Please help.

Thanks

Explanation / Answer

the two equations are the same at both hights.  (terminal velocity of a free fall human) the only difference is the density of air at each location.  make the two equations equal to each other with the higher level density as your unknown, the solve.

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