Let's revisit our archery problem from earlier with a little more information. Andrew is an avid archer. He launches an arrow that takes a parabolic path. The
equation of the height of the arrow with respect to time is y= -4.9x2 + 48x,
where y is the height of the arrow in meters above Andrew's bow and 2 is the time
in seconds since Andrew shot the arrow. Find how long it takes the arrow to come
back to a height even with his bow height.