You are asked to calculate an object's velocity, in order to do so you must know the object's

There are multiple ways to know some object velocity:

One is knowing the distance that it travels in some amount of time, you can do the quotient (because velocity is a measure of distance over time) and obtaining the mean velocity of the object in that period of time.

Other way is knowing the acceleration of the object for a certain time, and the initial velocity of the object, we know that if we integrate the acceleration over time we get the velocity, and when we integrate, we must add a constant of integration, which is the initial velocity of the object.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

it was given as a lesson and guide for prayer.