March 19th, 2017, 02:57 AM  #1 
Newbie Joined: Mar 2017 From: Finland Posts: 1 Thanks: 0  question about derivation logic
Hi, i ended up to impossible conclusion of my calculations. I pondered the formula for velocity as below: s=vt >> ds/dt = v >> v=s/t when we put these together we'll get: >> ds/dt = s/t >> ds = s/t dt >> s = integral(ds) = integral (s/t) dt = s ln(t) >> ln(t) = 1 >> t = e what went wrong? 
March 19th, 2017, 04:01 AM  #2 
Senior Member Joined: Feb 2016 From: Australia Posts: 850 Thanks: 310 Math Focus: Yet to find out. 
ds/dt denotes the function, s'(t). Why do you think it's o.k. to multiply both sides by dt in the fourth line? Also, where are your constants of integration?


Tags 
derivation, logic, question 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Symbolic logic, SD rules, subderivation question  cag805  Applied Math  1  December 22nd, 2013 02:09 PM 
derivation trees question  lamhmh  Applied Math  1  July 28th, 2011 02:12 AM 
Logic question  new2math  Applied Math  3  December 15th, 2010 09:05 PM 
logic question  gladtoknow  Algebra  12  October 21st, 2009 11:07 AM 
TRIG DERIVATION QUESTION!!  dagitt  Algebra  1  June 2nd, 2008 02:31 PM 