Show the video to your class. Give students time to complain and talk about seeing this commercial. Then take guesses from students about the actual time it would take to collide.
After students have worked for a while and you have traveled around and selected some students and their work to share, reveal our answer to this question.
For members we have included a solution sheet and teaching suggestions.
Thanks to our friends Kim Lequire and Kyra Mercado for telling us about this video.
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