Posted by Rachel on .
a stone thrown upward from the top of a 320foot cliff at 128 ft/sec eventually falls to the beach below?
how long does the stone take to reach its highest point?

Maaaath 
Steve,
the height h is
h(t) = 320 + 128t  16t^2
The vertex of this parabola is at t = 4
So, figure h(4)