<PRE><B>Question 757737</B>
Tom hits a volleyball at an equation like y=-16t^2+31t+2. After how much time will it take for the volleyball to hit the ground?
---------
y is the height of the ball at time = t seconds.
------
Height is zero when ball hits the ground:
--------
-16t^2+31t+2 = 0
----
t = [-31 +- sqrt(31^2-4*-16*2)]/(-32)
----------------------------------------
Find the Positive solution.
=====================
Cheers,
Stan H.
===================</PRE>