When sky divers initially fall from an airplane their velocity v in miles per hour after free falling d feet can be approximated by v=60/11√d. (Because of air resistance, they will eventually reach terminal velocity.) How far do sky divers need to fall to attain a velocity of 55 miles per hour? (This value for d represents the minimum distance.)

Question

When sky divers initially fall from an airplane their velocity v in miles per hour after free falling d feet can be approximated by v=60/11√d.  (Because of air resistance, they will eventually reach terminal velocity.)  How far do sky divers need to fall to attain a velocity of 55 miles per hour?  (This value for d represents the minimum distance.)
A sky diver needs to fall about ? feet to attain a velocity of 55mph.

Steve · Answer

55 = 60/11 √d 10.08 = √d 101.67 = d

Kathleen · Answer

Can you explain how you got the answer above!