physic
https://www.youtube.com/watch?v=NBHc8uBJq4A
Happy Ball
https://www.youtube.com/watch?v=YJDaetH9djQ&feature=youtu.be
Sad ball drop
https://www.youtube.com/watch?v=0DhnmR71YxY&feature=youtu.be
Bouncing Spring
https://www.youtube.com/watch?v=Vl9q_43S-Es
5 years ago 50
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- 110-Lab06-EnergyII.docx