A 10 gram coin is which is initially at rest is dropped from the observation deck of a skyscraper 350 meters above the street below. 1. What is the work done by gravity on the coin as it falls? (In Joules)
2. Because there is air resistance the coin was slowed and hit the ground with a final velocity of 55 m/s. What is the kinetic energy of the coin at this speed? ? (In Joules)
3. How much work was lost to air resistance as the coin fell? (In Joules)
4. What is the average force exerted on the coin due to the air resistance as it fell?

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explanation:

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.