Courtney believes that the dinosaurs went extinct as a result of a giant asteroid hitting the earth. scientists discovered a 150 km wide crater dating back to the time of their extinction, according to the fossil record. the crater and the fossil record are examples of researched data that support courtney’s explanation.

 The explanation given by Courtney regarding the extinction of the dinosaurs is true.

Further Explanation:

The dinosaurs were considered to be present on the Earth about ago. It is believed that the extinction of the dinosaurs was due to the effect of a very huge asteroid that hit the Earth.

The effect of the asteroid led to the formation of the huge cloud of dust in the atmosphere. This blocked the sunlight from entering the Earth and due to this, the temperature of the Earth reduced significantly and then as the cloud cleared, the greenhouse gases caused the increase in the temperature.

This sudden change in the climatic conditions of Earth led to the extinction of the dinosaurs. The scientists discovered a wide crater on the Earth hat signifies the impact of a huge asteroid.

Therefore, the explanation given by Courtney regarding the extinction of the dinosaurs is true.

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Answer Details:

Grade: High School

Chapter: Science

Subject: Physics

Keywords:  Scientists, 150 km crater, huge asteroid, dinosaurs, impact of asteroid, gases, temperature, Yucatan peninsula.

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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.