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en.wikipedia.org/wiki/Deceleration_parameter

The deceleration parameter q {\displaystyle q} q in cosmology is a dimensionless measure of the cosmic acceleration of the expansion of space in a Friedmann– Lemaître–Robertson–Walker universe. It is defined by: q = d e f − a ¨ a a ˙ 2 {\ displaystyle q\ {\stackrel {\mathrm {def} }{=}}\ -{\frac {{\ddot {a}}a}{{\dot {a}}^{2}}}} q\  ...

www.softschools.com/formulas/physics/deceleration_formula/44

Deceleration is the opposite of acceleration. It is the rate at which an object slows down. Deceleration is the final velocity minus the initial velocity, with a negative sign in the result because the velocity is dropping. The formula for acceleration can be used, recognizing that the final result must have a negative sign.

formulas.tutorvista.com/physics/deceleration-formula.html

It is the decrease in speed as the body moves away from initial position. It is expressed as. Deceleration can also be called as the negative acceleration. Hence it is denoted by - a. If initial velocity, final velocity and time taken are given, Deceleration Formula is given by. If initial velocity, final velocity and distance traveled are ...

byjus.com/deceleration-formula

Deceleration formula using distance | whats the formula for deceleration | Deceleration physics definition ,deceleration calculator m/s | How to calculate deceleration on a speed time graph.

www.quora.com/What-is-the-equation-for-deceleration

Deceleration is just a name for negative acceleration so the equation will be the same as acceleration equations and the values will determine if the object ...