Answer:
0.02 s
Explanation:
Take the (+x) direction to be up. Â
The average velocity v during a time interval Δt is the displacement Δx divided by Δt. Â
v=Δx/Δt
 =x_f-x_i/t_f-t_i         (1)
We assume that your height is 1.6m Â
Solving [1]
Δt=Δx/v
 = 0.02 s