Use the equation
[tex]vf = vo + a \times t[/tex]
plug in the variables for the equation. Use 0 for Vf because at the highest point the velocity would be zero. Use -9.8 for acceleration because that is the speed at which gravity pulls down.
[tex]0 = 20.2 + ( - 9.8) \times t[/tex]
your answer would be 2.06122 seconds.
