A stone is thrown vertically upwards and falls back into the same hand. How does the time going up compare with the time coming down?

1. The only force acting is gravity, so the acceleration is the same size and direction throughout. 2. That uniform acceleration makes the upward and downward halves of the flight mirror images. 3. The time taken to rise from the hand to the highest point equals the time taken to fall back to the hand. 4. This is called time symmetry, and it lets information about one half be used for the other. 5. Nothing slows the ball more on one leg than the other here, so neither leg can take longer. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 3: Vertical projectile motion in one dimension_