posted by gale on .
A girl makes a jump in the long jump with an initial velocity of 12 m/s. She leaves the ground at 20 degrees above the horizontal. How far is her jump?
See my other answer. You posted this twice. I gave you the formula to use, but did not derive it. That is something you should do yourself.
The assumed takeoff speed is completely unrealistic, as I note in my other answer.