My Math Forum  

Go Back   My Math Forum > College Math Forum > Calculus

Calculus Calculus Math Forum

LinkBack Thread Tools Display Modes
March 19th, 2017, 02:57 AM   #1
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:

>> 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?
totten123 is offline  
March 19th, 2017, 04:01 AM   #2
Senior Member
Joined: Feb 2016
From: Australia

Posts: 1,591
Thanks: 546

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?
Joppy is offline  

  My Math Forum > College Math Forum > Calculus

derivation, logic, question

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Symbolic logic, SD rules, sub-derivation question cag805 Applied Math 1 December 22nd, 2013 01:09 PM
derivation trees question lamhmh Applied Math 1 July 28th, 2011 02:12 AM
Logic question new2math Applied Math 3 December 15th, 2010 08:05 PM
logic question gladtoknow Algebra 12 October 21st, 2009 11:07 AM
TRIG DERIVATION QUESTION!! dagitt Algebra 1 June 2nd, 2008 02:31 PM

Copyright © 2018 My Math Forum. All rights reserved.