Answer to Question #262652 in Physics for Ratman

Question

At what altitude must a military plane flying horizontally at 1.75m/s be in order to deliver relief goods to typhoon yolanda survivors? The survivors are in an evacuation center 1750m away from where the plane is.

Answer 1

The time to pass 1750 m at 1.75 m/s:

$$t=d/v.$$

The height of free fall that corresponds to this height:

$$H=gt^2/2=gd^2/(2v^2)=4.9·10^6\text{ m}.$$