Question 576124
{{{ h = -2t^2 }}}
This is a quadratic, or parabola
The minus sign means that there is a maximum
and not a minimum.
There is no constant term, which means the 
parabola is symmetric about the y-axis
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Here's a plot:
{{{ graph( 400, 400, -5, 5, -5, 5, -2x^2 ) }}}