Author Topic: TT2-2019 Past Test, Morning Sitting  (Read 350 times)

YuyingC

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TT2-2019 Past Test, Morning Sitting
« on: October 28, 2020, 11:13:14 PM »
For the morning sitting question in 2019 TT2, why is C2' = e^t/(e^t+1)?

Jing_Wang

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Re: TT2-2019 Past Test, Morning Sitting
« Reply #1 on: October 29, 2020, 01:26:28 AM »
I encountered the exact same problem and I think (C2)' should equal -e^t/(e^t+1).
Consequently, the constant c2 I find for part (b) is ln2 instead of -ln2.
Also, if it is intended in the question that g = 12/(e^t+1), most things in the solution are to be multiplied by a factor of 6.

YuyingC

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Re: TT2-2019 Past Test, Morning Sitting
« Reply #2 on: October 29, 2020, 06:36:33 AM »
Yes, I have got the same answer as you. Doubt that the solution is incorrect.