The physics
Kinetic energy is the energy of motion: half the mass times velocity squared. The squared term is the punchline — double your speed and you carry four times the energy, which must all go somewhere when you stop.
Kinetic energy of a 0.145 kg baseball at 145 km/h
Answer: kinetic energy = 117.6 J (in kilowatt-hours 3.267e-5 kWh).
What we know
- Mass: 0.145 kg
- Velocity: 145 km/h = 40.27777778 m/s (converted to the unit the formula takes)
Step by step
- Given
- m = 0.145 kg, v = 40.27777778 m/s
- Formula
- KE = ½ × m × v²
- Substitute
- KE = ½ × 0.145 × 40.27777778²
- Result
- KE = 117.6 J
All results
| Kinetic energy | 117.6 J |
|---|---|
| In kilowatt-hours | 3.267e-5 kWh |
Open the kinetic energy calculator with these numbers → and change any of them.