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f^{\prime\prime}(t_i) \approx \frac{f(t_i+1)-2f(t_i) +f(t_i-1)}{ ( \Delta t) t^2^2} |
4. Numerically differentiate your knee and ankle position data to obtain the appropriate linear velocities and accelerations for these markers. You don’t need to find the velocities and accelerations for the first and last data points.
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