The fastest recorded skydive was by an Air Force officer who jumpedfrom a helium balloon at an elevation of 10?

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immortallyrics

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The fastest recorded skydive was by an Air Force officer who jumpedfrom a helium balloon at an elevation of 103,000ft, three timeshigher than airliners fly. Because the density of air is solow at these altitudes, he reached a speed of 614 mph at anelevation of 90,000ft, then gradually slowed as the air became moredense. Assume that he fell in the spread-eagle position andthat his low-altitude terminal speed is 125mph.

1) Use this information to determine the density of the airat 90,000ft.

help please no idea what to do! please explain with equations
d1=103000ft=31,394.3m
v1=614mph=274.5m/s
d2=90000ft=27432m
v2=125mph=55.9m/s

now what?
 
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