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October 23rd, 2014, 06:26 PM  #11  
Member Joined: Oct 2014 From: NJ Posts: 46 Thanks: 2  Quote:
I emailed my teacher, hopefully I get some clarification. Thanks, I'm glad someone is thinking the same thing I am. Last edited by shreddinglicks; October 23rd, 2014 at 06:32 PM.  
October 23rd, 2014, 06:36 PM  #12 
Member Joined: Oct 2014 From: NJ Posts: 46 Thanks: 2 
Also, the answer key has initial conditions. x(0) = 1/4 , x'(0) = 0. Where does that come from? 
October 23rd, 2014, 06:54 PM  #13 
Member Joined: Oct 2014 From: NJ Posts: 46 Thanks: 2 
I think I figured it out, our assumption of the units must be correct. 3 inches is a (1/4) of a foot. That would satisfy the initial condition and our assumption of the units.

October 23rd, 2014, 06:57 PM  #14 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,671 Thanks: 2651 Math Focus: Mainly analysis and algebra 
I agree.

October 24th, 2014, 12:44 AM  #15  
Senior Member Joined: Jun 2013 From: London, England Posts: 1,316 Thanks: 116  Quote:
Ironically, however, in everyday life, Kg is used as a measure of weight (force). You buy something by what it weighs. When you see 2.2 lbs on some scales then that's right, but when you see 1 kg, then that's really 9.8N being measured.  

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