Jounce
In physics, jounce or snap is the fourth derivative of the position vector with respect to time, with the first, second, and third derivatives being velocity, acceleration, and jerk, respectively; hence, the jounce is the rate of change of the jerk with respect to time. Jounce is defined by any of the following equivalent expressions:
The following equations are used for constant jounce:
where
The notation 
(used in ) is not to be confused with the displacement vector commonly denoted similarly. Currently, there are no well-accepted designations for the derivatives of jounce. The fourth, fifth and sixth derivatives of position as a function of time are "sometimes somewhat facetiously" referred to as snap, crackle and pop respectively. Because higher-order derivatives are not commonly useful, there has been no consensus among physicists on the proper names for derivatives above jounce.
The dimensions of jounce are distance per (time to the power of 4). In SI units, this is "metres per quartic second", "metres per second per second per second per second", m/s4, m · s−4, or 100 Gal per second squared in CGS units. This pattern continues for higher order derivatives, with the 5th being m/s5.
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Segovia
by: JuanesUn once de noviembre
A las siete de la noche
Hombres armados dispararon sin reproches
Contra la gente del municipio de Segovia
Llovia a cantaros, la plaza estaba llena
Varias granadas estallaron en cadena
El nordeste antioqueño todo rojo se torno
Es una cancion por los que murieron alla en Segovia
Y por todas las familias que fueron victimas en Segovia
No van a desaparecer
Nunca jamas de la memoria
No van a desaparecer
Aunque los quieran desaparecer
Llovia a cantaros, la plaza estaba llena
Varias granadas estallaron en cadena
El nordeste antioqueño todo rojo se torno
Es una cancion por los que murieron alla en Segovia
Y por todas las familias que fueron victimas en Segovia
No van a desaparecer
Nunca jamas de la memoria
No van a desaparecer
Aunque los quieran desaparecer
Es una cancion por los que murieron alla en Segovia
Y por todas las familias que fueron victimas en Segovia
No van a desaparecer
Nunca jamas de la memoria
No van a desaparecer
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