Look back at 7 & 8 and compare the distances and speeds. If you a ball leaves your hand at 5 m/s, it reaches a height of 1.27 m. If you drop a ball from 1.27 m, it will land in your hand at 5 m/s.
Similarly, if you throw a ball upward at 5 m/s, it will take 0.51 seconds to reach the top. If you drop a ball, it will take 0.51 seconds to reach a speed of 5 m/s.
If you throw a ball with 5 m/s and it lands back in your hand, the displacement is 0 and using the second motion equation, you will find the toss took 1.02 seconds.