Time of Flight

The time of flight is twice the time to reach the maximum height, tmax.
Since the time to reach maximum height is tmax =
- vy(0)
The time of flight is tflight = 2tmax =
2 vo sinθ

The time of flight is determined solely by the initial y-velocity and g. Motion along x is irrelevant!

Three balls are launched straight up in the air. The ratio of their initial speeds is 1:2:3, in the order red:green:blue. What is the ratio of their times of flight, in the same order?

  1. 1:2:3
  2. 1:4:9
  3. It depends on the ratio of their masses