Impact speed refers to the velocity of a falling object at the moment it strikes the ground, while terminal velocity is the maximum speed reached when the force of air resistance equals gravitational force, resulting in zero net acceleration. The equation vt=9.8t provides a way to calculate the speed at impact for an object falling from rest. As an object falls, it accelerates until air resistance increases to balance gravitational pull, leading to terminal velocity. Understanding the distinction between these two concepts is crucial for physics applications involving free fall and motion. The discussion clarifies the dynamics of falling objects in relation to speed and resistance.
