#$&* course Phy 121 3/4 936 The motion in 2D displays a red ball on the screen and it asks you to drag it. When you click to drag the ball and move the mouse two arrows are displayed one for velocity and the other one for acceleration of the ball. The arrows will increase or decrease depending on how quick you drag the ball in any direction. One arrow may appear longer or get longer than the other one I assume that that arrow is the acceleration arrow. You can also click one of the sections at the bottom of the screen and the ball will move all on its own.