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**Galileo** developed this concept through his famous ramp experiment. He rolled a ball down a ramp from a specific height, observing that the ball accelerated as it descended, maintained a constant speed on the flat section, and decelerated as it ascended the opposite ramp. Remarkably, the ball came to rest at approximately the same height from which it was initially released. Galileo then considered what would happen if the ramp were infinitely long with an imperceptibly small upward slope. In this case, the ball would never reach its original height and, therefore, would continue rolling indefinitely. This led to his development of the concept of inertia, the idea that an object in motion will continue moving in a straight line unless acted upon by an external, unbalanced force.
