Velocity Calculator: Average Velocity Formula
Calculate the average velocity of an object using displacement and time.
What is Velocity?
Velocity is a physical quantity that describes how fast an object changes its position and in which direction it moves. It is defined as the rate of change of displacement with respect to time.
Unlike speed, which only measures how fast an object moves, velocity is a vector quantity. This means it has both magnitude (how fast) and direction (where it is moving).
Velocity vs Speed
Although velocity and speed are related, they are not the same. Speed is a scalar quantity that depends only on distance traveled, while velocity depends on displacement.
An object can have a constant speed but a changing velocity if its direction changes, such as when moving in a circular path.
Velocity Formula
- 1Velocity (v) = Displacement (d) ÷ Time (t)
- 2Displacement is the straight-line change in position, not total distance traveled.
- 3Time is the interval during which the motion occurs.
How to Calculate Velocity Step by Step
- 1Determine the displacement of the object in meters.
- 2Measure the time taken in seconds.
- 3Divide displacement by time.
- 4Attach direction if required to fully describe velocity.
Velocity Calculation Examples
Example 1: Straight-Line Motion
An object moves 100 meters east in 10 seconds. Velocity = 100 ÷ 10 = 10 m/s east.
Example 2: Negative Velocity
If an object moves 50 meters west in 5 seconds, its velocity is −10 m/s, where the negative sign indicates direction.
Example 3: Zero Velocity
If displacement is zero, velocity is zero even if the object traveled some distance.
Average Velocity Explained
Average velocity is calculated over a time interval and depends only on the initial and final positions of an object.
It is given by total displacement divided by total time, regardless of the path taken between the two points.
Common Velocity Calculation Mistakes
- Using total distance instead of displacement.
- Ignoring direction when velocity is required.
- Mixing different units for distance and time.
- Confusing instantaneous velocity with average velocity.
Velocity FAQs
What is the SI unit of velocity?
The SI unit of velocity is meters per second (m/s).
Can velocity be negative?
Yes. Negative velocity indicates motion in the opposite direction relative to the chosen reference direction.
Is velocity always constant?
No. Velocity changes if an object changes speed or direction.
What is the difference between average and instantaneous velocity?
Average velocity is calculated over a time interval, while instantaneous velocity is the velocity at a specific moment in time.
Why Use This Velocity Calculator?
This velocity calculator provides a quick and accurate way to calculate average velocity using the correct physics definition. It is useful for students, teachers, engineers, and anyone studying motion.
Enter displacement and time to instantly compute velocity without manual calculation errors.