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Stephen Sekula (steve@chirp.cooleysekula.net)'s status on Sunday, 30-Dec-2018 23:11:06 UTC Stephen Sekula I have my students in #PHYS1303 do a 1-D motion problem on this very subject on their first homework assignment. Not an easy problem. Hard to visualize. This is PERFECT. https://twitter.com/universal_sci/status/1079044080208773122