What speed must you toss a ball straight up so that it takes 4 s to return to you? Show your work.

1) Type of motion: constant acceleration.

2) acceleration, a = 9.8 m/s^2

3) time up = time down = 4seconds / 2 = 2 seconds

4) formula = Vf = Vo - a*t^2/2

Vf = 0 = > Vo = a*t^2 / 2 = 9.8m/s^2 * (2 s) ^2 / 2 = 19.6 m/s

Answer: 19.6 m/s