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 ...

study.com/academy/lesson/calculating-deceleration-definition-formula-examples.html

In this lesson, you will learn about **deceleration**, what it means, and how it is a
specific special case of acceleration. You will learn about which **equations** can
be used to calculate **deceleration** and how to identify **deceleration** from position-
time and velocity-time graphs of motion.

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

In physics **deceleration** does not really exist as a stand alone idea, in terms of the
English language **deceleration** has meaning but in physics there is really no such
thing as a **formula** for **deceleration**. Allong a particular direction acceleration may
cause an object to slow down and in English we would call ...

sciencing.com/calculate-deceleration-6081657.html

Apr 24, 2017 **...** 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 ...