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**1. A tennis ball is thrown from ground level with velocity directed above the horizontal. If it takes the ball 0.50 s to reach the top of its trajectory, what is the magnitude of the initial velocity? You should draw a diagram to show this problem in your explanations.**

i no that Ax=0 Ay=-9.8 i have all the equations just I dont know which to use, once i figure taht out i should be fine any help would be great