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## Accident Reconstruction Calculators

Below are some basic accident reconstruction tools. They should be used to estimate ranges of answers for common reconstruction calculations. Most problems involves more complicated factors so make sure to consult an Automotive Engineer.

# Acceleration: Distance to Speed

This equation is used to estimate the distance it takes to reach a given speed, at a pre-determined level of acceleration. This equation is rearrangement of the Acceleration: Time to Speed equation

Explanation:

D = (Final Speed^2 – Initial Speed^2)

Acceleration

or

D = (Sf^2 – Si^2)

(30 x A)

Where:

D = Distance Traveled (feet)
Sf = Final Speed (mph)
Si = Initial Speed (mph)
30 = Conversion (converts feet per second to miles per hour)
A = Acceleration (g’s)

Example Calculation:

How far would a passenger car travel while accelerating from 30 to 60 mph at a brisk rate?

Low: D = (Sf2 – Si2 ) / (30 x A) = (602 – 302 )/ (30 x 0.2) = 450 feet

High: D = (Sf2 – Si2 )/ (30 x A) = (602 -302 )/ (30 x 0.1) = 900 feet

AVERAGE ACCELERATION OF DIFFERENT VEHICLES                                                                 Acceleration (g's)

From                                         To

Passenger cars, Normal Acceleration

Less than 30 mph                                                                                                                  0.1                                           0.2

More than 30 mph                                                                                                               0.05                                          0.1

Passenger cars, Brisk Acceleration

Less than 30 mph                                                                                                                  0.2                                           0.4

More than 30 mph                                                                                                                0.1                                           0.2

Large or Loaded Trucks, Normal Acceleration

Less than 30 mph                                                                                                                 0.05                                           0.1

More than 30 mph                                                                                                              0.025                                         0.05

Large or Loaded Trucks, Brisk Acceleration

Less than 30 mph                                                                                                                  0.1                                           0.2

More than 30 mph                                                                                                               0.05                                          0.1

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