Physics Formulas: Motion, Force and Energy Explained
The core mechanics formulas every student needs — velocity, acceleration, the equations of motion, force, momentum, work, energy and power — explained plainly with worked examples.
Velocity Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Final velocity
49.000
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Velocity Calculator
The Velocity Calculator works out your final velocity in an instant. Enter initial velocity (u), acceleration (a) and time (t) and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the initial velocity (u).
- Enter the acceleration (a).
- Enter the time (t).
- Read off your final velocity — the calculator updates automatically, with no button to press.
Formula
The Velocity Calculator uses the formula:
Final velocity = Initial velocity (u) + Acceleration (a) × Time (t)
Worked example
For example, with initial velocity (u) of 0 m/s, acceleration (a) of 9.8 m/s² and time (t) of 5 s, the final velocity is 49.000.
| Initial velocity (u) | 0 m/s |
|---|---|
| Acceleration (a) | 9.8 m/s² |
| Time (t) | 5 s |
| Final velocity | 49.000 |
|---|
Results are estimates for educational use, not professional advice.
Key terms explained
- Acceleration
- The rate at which an object's velocity changes over time.
- Velocity
- The speed of an object in a given direction.
Frequently asked questions
Use v = u + at. Starting from rest with 9.8 m/s² for 5 seconds gives a final velocity of 49 m/s.
u is the starting velocity, a is acceleration, t is time and v is the velocity at the end.
Yes. A negative acceleration (deceleration) reduces velocity over time and can make the object slow, stop or reverse.
Yes. The equation v = u + at applies when acceleration stays constant over the time interval.
Enter the initial velocity (u). Enter the acceleration (a). Enter the time (t). Read off your final velocity — the calculator updates automatically, with no button to press.
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