v=vi*e^(-ct)(adsbygoogle = window.adsbygoogle || []).push({});

The question asks to differentiate that equation for v(t) and thus show that the acceleration is porportional to the speed at any time.

I have no clue how to differentiate. Could someone start me off or give some clues? I'll find th rest in my text book. Thanks

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# Homework Help: Differentiate that equation for v(t)

**Physics Forums | Science Articles, Homework Help, Discussion**