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I understand the method to be:

[itex]v_{i+1}=v_{i}+a_{i+1}δ[/itex]

[itex]x_{i+1}=x_{i}+v_{i+1}δ[/itex]

With only the current conditions I can’t evaluate [itex]a_{i+1}[/itex] and am stuck.

Any help on how the implicit methods work would be really appreciated.

I’ve considered using [itex]a_{i+1}= a_{i}+ (a_{i}-a_{i-1}){δ} [/itex] but then that’s not really an implicit method is it? – you’re simply reusing the acceleration from last time around.

Thanks in advance,