# what is her maximum height how long after she leaves trampoline does she reach max height how long is she in air how high off the ground is trampoline a trampoline artist bounces on a trampoline her height above the ground is modelled by the function h=-4.9(t-1)²+6.3 "h" measures the height above the ground in meters and "t" measures the time after she leaves the trampoline in seconds. corresponding question above.

## Expert Answers The maximum height of the artist is found when the parabola is at its vertex.  Since the function `h=-4.9(t-1)^2+6.3` is already in vertex form, the maximum height is when the quadratic portion is zero.  That is when `t-1=0` which is the same as when t=1.

At t=1, the maximum height is `h=-4.9(0)^2+6.3 = 6.3` metres.

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