Time of flight is

t

=

2 vo sin(θ) g

where g = 9.8 m/s²

The time of flight is also determined solely by the initial velocity in the y direction and the acceleration due to gravity.

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