Kinetic Energy: 2 kg at 3 m/s (Textbook Example)
A 2 kg object moving at 3 m/s has a kinetic energy of 9 joules — a classic textbook calculation.
How to use this tool
- Enter mass and speed in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your kinetic energy and the full breakdown beneath it.
A standard physics textbook example: 2 kg at 3 m/s gives KE = ½ × 2 × 9 = 9 joules.
Frequently asked questions
- Why does speed have a larger effect than mass?
- Because speed is squared. Doubling mass doubles KE; doubling speed quadruples it.
- How do I convert km/h to m/s?
- Divide by 3.6. For example, 90 km/h = 25 m/s.