The ball you will fire has a mass of 12.2 g. The gravitational field of the planet is 9.00 N/kg
The ball falls a vertical distance of 812.0 mm as it goes from the launcher to the ground.
Click on the zoomed in view of the launcher to fire the ball.
Use the acceleration due to gravity to find the time of flight.
Find the vertical speed of the ball right before hitting the ground.
Based on where the ball lands, determine the launch speed of the ball.

the answer is d. 4

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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.

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