An airplane flies at 40 m/s at an altitude of 500 m. The pilot drops a package that falls to the ground, How long does it take for the package to reach the ground?

10.1 s

Explanation:

The time of flight of the package is entirely determined by its vertical motion, which is a free fall motion (it is acted upon the force of gravity only). Therefore, it is a uniformly accelerated motion, so we can use the suvat equation:

where

s is the vertical distance covered

u is the initial vertical velocity

t is the time of flight

is the acceleration due to gravity

For the package in this problem, we have:

s = 500 m is the vertical distance covered

u = 0 is the initial vertical velocity (initially it has only horizontal motion)

So, solving for t, we find the time of flight:

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