is the layer of the atmosphere where jets fly through and contains ozone layer

TROPOSPHERE

Explanation:

The TROPOSPHERE is the assumed lowest part of the atmosphere. It is the second layer.

Expert says jets can fly above or below this region, nonetheless, the TROPOSPHERE yet, is the most appropriate position for jets flying.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be