Solving non-linear ode

I have this ode of acceleration:

where 2B(Fi,Li )=const

I need to find the postion function and then derivate to find the velocity. I tried to use ode45 and then tried to derivate using diff but I get an error :u ndefined function 'diff' for input arguments of type 'struct'.

anyone has an idea how i can solve this ode and then to find the velocity?

Answer 1

[Alan Stevens]

ODE45 solves first order equations, so represent your second order one as two first order ones:

ODE45 will then automatically return the velocity as well as the displacement. (See documentation on ODE45 for more details).