Solving ODE

[SFares]

Hello,

in the attached sheet, please scroll down to red arrow, i am trying to solve this differential equation. i tried to follow the steps in the Help file. i am not sure what i am doing wrong. Thank you!

[AlanStevens · Accepted solution]

See attached.

Alan

[SFares]

Thank you Alan!

[SFares]

Alan,

just a follow up a question. if i try to find x(2) value and x`(2), the value i am getting for x(2) does not match the answer in the example highligted in yellow. and i am not sure how to determine velocity x`(2).

[AlanStevens]

If you check the derivative of the theoretical solution at t = 0 you will find it isn't 0.15 as stated; it is 0.444938. Use this as your initial value for x`(0) and you will get the same value at t = 2 as given in the theory.

To get dx/dt after the solve block, you need to define the function

then call dxdt(2) (say) to get specific values.

Alan

[ValeryOchkov]

I think it will be better solve with Prime with UNITS: