SOLUTION: A ball is thrown upward with an initial velocity of 64ft/sec from a height 720ft. It's height s, in feet, after t seconds is given by s = -16t^2 + 64t + 720. After how long will th

Algebra ->  Equations -> SOLUTION: A ball is thrown upward with an initial velocity of 64ft/sec from a height 720ft. It's height s, in feet, after t seconds is given by s = -16t^2 + 64t + 720. After how long will th      Log On


   

Question 1048745: A ball is thrown upward with an initial velocity of 64ft/sec from a height 720ft. It's height s, in feet, after t seconds is given by s = -16t^2 + 64t + 720. After how long will the ball reach the ground? Please show work.
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
A ball is thrown upward with an initial velocity of 64ft/sec from a height 720ft. It's height s, in feet, after t seconds is given by
s = -16t^2 + 64t + 720. After how long will the ball reach the ground? Please show work.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Similar problems were solved in lessons
    - Problem on an arrow shot vertically upward
    - Problem on a ball thrown vertically up from the top of a tower
in this site.

Consider them as a sample. Read them attentively.
Then solve your problem by substituting your data.