I am trying to figure out how to approach the following problem:



Tests are being run on a machine used to shoot balls into the air. A ball is launched at 11:59:58 AM EST with an upward velocity of 14.7 meters per second. The ball reaches a maximum height of approximately 20 meters. Identify the initial height of the ball and write a function to model the height of the ball with respect to time. What is the height of the ball at 12:03:28 PM EST?



I think that I should use one of the following equations,

or



Which of these equations should I use? Why do these equations work for this problem?