Brilliant! The ball starts from a y co-ordinate of \(10\) and then falls to the ground, which has a y co-ordinate of \(0\). So, the displacement is \(0-10 = -10\)
It is very important to remember that displacement means you must calculate \(\text{Final position}\) \(- \text{Initial Position}\). Many students calculate \(\text{Initial Position}\) \(- \text{Final position}\) and get the opposite sign.
What is the displacement of the ball in the case of this animation? Assume the ball is initially dropped from \(y=10\)