How do you complete the square step by step please.

1. Part 1 - Application Physics shows that when an object is thrown upward with an initial velocity of vo, then its approximate height is given by this quadratic function. s = -4. 9t + vot + h A ball is thrown upward from the top of a building 15 meters high, at a velocity of 2.8m/sec. Answer the following questions. Be sure to show and explain all work. a. Find the maximum height and the time in which it was attained (round to 3 decimal places) b. When does it reach the ground? (round to 3 decimal places) c. Sketch a graph to illustrate your answers