Rush of crowd needs some calmness urgently

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Possible Answers: SURGE.

Last seen on: The Guardian – Cryptic Crossword No 27,664 – Nov 12 2018

Random information on the term “SURGE”:

In physics, jerk is the rate of change of acceleration; that is, the time derivative of acceleration, and as such the second derivative of velocity, or the third time derivative of position. According to the result of dimensional analysis of jerk, [length/time3], the SI units for its magnitude are m/s3 (or m⋅s−3); this can also be expressed in standard gravity per second (g/s).

Jerk is a vector, and (as with acceleration) there is no distinct term to denote its scalar magnitude (more precisely, its norm, as, e.g., there is “speed” for the norm of the velocity vector).

Jerk can be formulated in any of the following equivalent ways:

where

There is no standard symbol for jerk, but j {\displaystyle j} is commonly used. Newton’s notation for the time derivative ( a ˙ , v ¨ , r . . . {\displaystyle {\dot {a}},{\ddot {v}},{\overset {…}{r}}} ) is also applied.

SURGE on Wikipedia