Answer:
c. the constant velocity of some falling objects.
Explanation:
When a body is dropped (or thrown up) vertically and only the force of gravity acts on it, it is said that the body carries a free fall motion. Free fall is a special case of uniformly varied rectilinear motion.
Therefore, the MRUV formulas will be applied, with a modification: The acceleration of the bodies in free fall is the acceleration of gravity represented by the letter g and is, on Earth, approximately equal to 9'8 m / s2.
<u>An object that falls</u>, initially gains speed. When gaining speed, the resistance force of the air will increase, which is nothing more than the result of collisions with the air molecules suffered by any object that travels through a layer of air. The greater the number of molecules with which it collides, the greater the resistance. Consequently, the air resistance depends on the speed of the falling object and its surface (its shape).
The object will continue to accelerate until the air resistance force is large enough to compensate for the force of gravity. At that time the object will continue to fall but will do so with <u>constant speed</u> (terminal velocity).
