According to Boyle's Law, if the temperature of a gas stays constant, when the volume increases, the pressure

We conclude that when the volume increases, the pressure decrease if the temperature of gas stays constant.

Explanation:

According to Boyle's Law, there exists an inverse relationship between Pressure and Volume such that

P ∝ (1/V)

P = k/V

It means the when the volume increases, the pressure decrease if the temperature of gas stays constant.

Thus, we conclude that when the volume increases, the pressure decrease if the temperature of gas stays constant.

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