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Non-convergence during root-finding in implicit method

When using implicit method such as backward Euler, velocity near zero may cause non-convergent root finding phenomenon, due to infinite oscillation, unable to satisfy the given threshold.

• One of the quick workaround, in this case, since the velocity is near zero, explicit method, such as Forward Euler or 4th order Runge-Kutta may be stable enough to be used instead.