The top ball moves with a hidden easing curve. Drag the two handles until the orange ball moves exactly like it. No graph of the answer until you submit.
Watch both balls travel together. Where does the top one hurry, hesitate, or overshoot?
time →progress ↑
Rule of thumb from the Material motion guidelines: small UI changes sit around 100 to 300 ms, and things that leave the screen should be faster than things that arrive. The curve decides how long it feels.