create velocity and acceleration 
"trail" node now can create both v and accel attributes.
accel is calculated only when velocity approximation is set to central difference.
At object level, set "Geometry Velocity Blur" to "Acceleration Blur".
Allow motion blur and increase "Geo Time Samples" to at least, 3.
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Your tips are helping me a lot. But the comment widget on this wiki is very unfriendly to non-Japanese. I have to answer the valid code or captcha according to the Japanese alphabet sheet.