Hi everyone, I'm kinda new and I'm trying to understand some kinematic principles which I cant really figure out... Without using intuition, what is the proof behind in explaining that the velocity of a rolling ball down a straight ramp increases and the velocity decreases when the rolling ball goes up a straight ramp? Intuitively, I know it's like that but I just wanna know the concept and proof behind this. Would be grateful if anyone could explain this concept in detail. Thanks!