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Speed (Physics) Calculator

Calculate speed from distance and time.

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Speed

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Overview

Speed is a scalar quantity representing the rate at which an object covers distance relative to the time elapsed. Unlike velocity, speed does not include directional information and is calculated by dividing the total path length by the travel duration.

Symbols

Variables

d = Distance, t = Time, v = Speed

Distance
Time
Speed
m/s

Apply it well

When To Use

When to use: This formula is applicable when determining the average rate of motion over a specific interval or the constant speed of an object. It assumes the path taken is the total distance traveled regardless of changes in direction.

Why it matters: Calculating speed is essential for navigation, logistics, and automotive safety, allowing for accurate travel time estimations. It serves as a foundational concept in classical mechanics for understanding kinetic energy and momentum.

Avoid these traps

Common Mistakes

  • Using minutes instead of seconds.
  • Speed vs Velocity confusion (scalar vs vector).

One free problem

Practice Problem

A cyclist travels a total distance of 45 kilometers in 1.5 hours. What is the average speed of the cyclist in kilometers per hour?

Distance45 m
Time1.5 s

Solve for:

Hint: Divide the total distance by the total time taken.

The full worked solution stays in the interactive walkthrough.

References

Sources

  1. Britannica: Speed
  2. Wikipedia: Speed
  3. AQA GCSE Physics Student Book
  4. Halliday & Resnick: Fundamentals of Physics
  5. Halliday, Resnick, and Walker, Fundamentals of Physics, 11th ed.
  6. Wikipedia: International System of Units
  7. Wikipedia: Imperial units
  8. Wikipedia: United States customary units