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**JBswe** Am studying for a upcoming test and am a little lost on the whole gravity and acceloration thing.

The question am working on is like this

"I ball is thrown stright up with a speed 25m/s"

The first part of this question is how high does the ball go.

I figured that to be 31.98m

25/9.81 = 2.55 The ball will reach 0 speed after 2.55s

then i divided 25/2 and got 12.5m/s

then 2.55*12.5 = 31.89m

now the hard part, I need to know what the times are when the ball reaches half the heigth....