Work–energy Theorem Calculator
🛹 Work, energy & power. Use the Work–energy theorem formula to find work done, mass, final speed, start speed: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Work done | J |
| Mass | kg |
| Final speed | m/s |
| Start speed | m/s |
Worked example
Find the work done when Mass = 2 kg, Final speed = 20 m/s, Start speed = 10 m/s.
Using W = 1/2mv² - 1/2mu²: Work done = 300 J.
Frequently asked questions
What is the formula for Work–energy theorem?
W = 1/2mv² - 1/2mu².
What do the letters stand for, and what units are used?
Work done in J, Mass in kg, Final speed in m/s, Start speed in m/s.
How do you calculate work done?
Put the values into W = 1/2mv² - 1/2mu². For example, with Mass = 2 kg, Final speed = 20 m/s, Start speed = 10 m/s, work done = 300 J.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (work done, mass, final speed, start speed) and fill in the others: it rearranges the formula for you.
