Kinetic Energy of a Tennis Ball at 55 m/s

A 58 g tennis ball served at 55 m/s (~125 mph) carries approximately 87.8 J of kinetic energy.

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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 professional tennis serve can exceed 200 km/h — calculate the kinetic energy behind a big first serve.

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.