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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