Two kids are playing outside with a ball $($so that they can socially distance$).$ However, one of them has very bad aim, and throws the ball straight up into the air where it travels passed the window you are studying at$.$

Your window has a total size $($height$)$ of $1\mathrm{.}50$ m$.$ The ball is visible as it passes your window for $0\mathrm{.}250$ s$.$ You happen to know that the bottom of your window is $6\mathrm{.}20$ m above the initial position the ball was thrown from.

What was the initial velocity of the ball after your friend released it on its upward motion?

Make sure to include a negative sign if the ball is moving downward.