Kinematic formulas in one-dimension

A child blows a leaf straight up in the air. The leaf reaches $1.0\,\text m$1, point, 0, start text, m, end text higher than its original height with a constant acceleration of $1.0\,\dfrac{\text m}{\text s^2}$1, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, squared, end fraction upward.

Let's calculate using a coordinate system where upward is positive.

$\text s$start text, s, end text