<https://sciencing.com/calculate-deceleration-6081657.html>
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"Deceleration is acceleration in reverse; whereas acceleration is the rate at which an object speeds up, deceleration is the rate at which it slows down. For example, an airplane screeching to a halt must have a high deceleration rate in order to stay on the runway, and an automobile must sometimes decelerate at a precise rate to stay in the flow of traffic. Two equations are useful for calculating deceleration. One involves the time it takes to slow the object and the other, the distance. Calculated rates of deceleration can be expressed in units of standard earth gravity (G’s)."
<https://sciencing.com/calculate-deceleration-6081657.html>