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So, is this true? I mean, does a movement by hand or leg make uniform or constant acceleration?

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This depends a lot on what you're doing with your hand. There is some evidence that people move along paths that minimize jerk or snap (the fourth or fifth derivative of position): – Colin K Jul 7 '12 at 3:32
@Colin K Thanks a lot. – mvr950 Jul 7 '12 at 3:52
The answer is clearly no. Indeed we have names for the art forms that concern themselves with the art of nonuniform body part acceleration: they are dance and choreography – WetSavannaAnimal aka Rod Vance Dec 15 '14 at 10:35

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