SOLUTION: a plane flies at 1000m above a man. the angle of elevation is 60 degrees, suddenly the angle is 30 degrees and 5 seconds later the angle of elevation in 45 degrees. what is the spe

Question 972926: a plane flies at 1000m above a man. the angle of elevation is 60 degrees, suddenly the angle is 30 degrees and 5 seconds later the angle of elevation in 45 degrees. what is the speed of the plane.
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
a plane flies at 1000m above a man. the angle of elevation is 60 degrees, suddenly the angle is 30 degrees and 5 seconds later the angle of elevation in 45 degrees. what is the speed of the plane.
***
let x=distance plane traveled in 5 sec
tan 45˚=1000/x
x=1000/tan45=1000/1=1000 m=1km
x=km/5s=km/5s*3600 s/hr
x=720 km/hr
What is the speed of the plane? 720 km/hr
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