Physics shows that when an object is thrown upward with an initial velocity of v0, then its approximate height is given by this quadratic function.

s=-4.9t^2+v0t+h

A ball is thrown upward from the top of a building 15 meters high, at a velocity of 3.1m/sec. Answer the following questions. Be sure to show and explain all work.

1. Find the maximum height and the time in which it was attained (round to 3 decimal places)
2. When does it reach the ground? (round to 3 decimal places)
3. Sketch a graph to illustrate your answers.