Question 698152
Here's the graph of the equation:
{{{ graph( 600, 400, -1, 9, -10, 280, -16x^2 + 119x + 54 ) }}}
The x-axis is in seconds and the y-axis is feet
If you plug in {{{ t = 7.8 }}} and then {{{ t = 7.78 }}} or {{{ t = 7.82 }}}
see how close you can get to {{{ h = 0 }}} ( hits the ground )