Follow the instructions of each sub-task, and submit your solution as instructed below:

1. Modify the moveDisc() s.t. the balls will bounce once reaching the screen

edges | linkLinks to an external site./n4. Modify the function updatevxvy() s.t. balls motion will be affected by gravity,

and stay within the bounded environment | linkLinks to an external site.

5. Add eyebrows to the moving ball | linkLinks to an external site.