A helicopter is flying horizontally with a speed v at an altitude h has to drop a food packet for a man on…

The aeroplane imparts $v$ velocity to the food packet horizontally when dropping. Horizontal range of food packet $=v\times \sqrt{\frac{2h}{g}}$
Also, Horizontal distance, travelled by aeroplane $=\mathit{v}\times \sqrt{\frac{2h}{g}}$ thus, vertical distance between aeroplane and person $=h$
distance $=\sqrt{\frac{2v^2 h}{ g}+h^2}$