~~~~~~~~~~~~FAN AND MEDAL!~~~~~~~~~~~~~~~
Derek kicks a soccer ball off the ground and in the air with an initial velocity of 31 feet per second. Using the formula H(t) = −16t2 + vt + s, what is the maximum height the soccer ball reaches?

14.2 feet

14.6 feet

15.0 feet

15.3 feet

Question

~~~~~~~~~~~~FAN AND MEDAL!~~~~~~~~~~~~~~~
Derek kicks a soccer ball off the ground and in the air with an initial velocity of 31 feet per second. Using the formula H(t) = −16t2 + vt + s, what is the maximum height the soccer ball reaches?

 14.2 feet

 14.6 feet

 15.0 feet

 15.3 feet

anonymous · Answer

@Hero

anonymous · Answer

Can You Help Me Solve This

anonymous · Answer

15,0 i believe

anonymous · Answer

i get 15.98 but hat isn't an option

anonymous · Answer

yeah so the closest would prob be 15.0 right?

anonymous · Answer

yeah but it also means either my math is wrong or the equation or answers are wrong. I am using -b/2a to find the x coordinate (time) of the vertex which = .96987.
Plugging that into -16t^+31 in place of t should give me the height of the vertex at that x, but it doesn't line up or legally round to 15.

anonymous · Answer

hmm idk what to do here

anonymous · Answer

http://answers.yahoo.com/question/index?qid=20110520181149AA0r2Bn you are right, 15

anonymous · Answer

yay thank you!

anonymous · Answer

i see where i messed up on my formula