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The animation below might clarify the concepts of the previous page a bit.
If you click the “Throw”-button a simulated throw of a ball will start. In the left part of the window below you will see how the velocity changes over time as the ball moves up and then down again.
The velocity changes from 20 m/s initially to 0 m/s when the ball has reached the peek, and then down to –20 m/s as it comes down again.
In the end, the yellow area, that corresponds to the displacement after 2 s will be equal in magnitude to the green area, that corresponds to the displacement in the downward motion. The yellow area correspond to 2·20/2=20 m and the green to 2·(–20)/2= –20 m. They add up to 0 m. The displacement in the end is 0. The ball is back (^^,).
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