Respuesta :
Answer:
254.56 m
Explanation:
    A object dropped from a plane from a certain height will follow a parabolic trajectory because it has a horizontal velocity equal to plane's velocity.
    So, if supplies are to be dropped from a plane from a height of 160 m, let us calculate the time it takes to reach the ground.
    [tex]H=\frac{1}{2}gt^{2}\\160=\frac{1}{2}\times10\times t^{2}\\t=\sqrt{32}=4\sqrt{2}\text{ }sec[/tex]
    So, in this time, the supply moves a horizontal distance of [tex](4\sqrt{2}\text{ }sec)\times(45\text{ }\frac{m}{sec})=180\sqrt{2}\text{ }m=254.56\text{ }m[/tex].
∴ The supply must be dropped when the plane is 255 m away.
