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 1,500 kg car at 70 mph
Answer: kinetic energy = 734,429.5 J (in kilowatt-hours 0.20401 kWh).
What we know
- Mass: 1500 kg
- Velocity: 70 mph = 31.2928 m/s (converted to the unit the formula takes)
Step by step
- Given
- m = 1500 kg, v = 31.2928 m/s
- Formula
- KE = ½ × m × v²
- Substitute
- KE = ½ × 1500 × 31.2928²
- Result
- KE = 734,429.5 J
All results
| Kinetic energy | 734,429.5 J |
|---|---|
| In kilowatt-hours | 0.20401 kWh |
Open the kinetic energy calculator with these numbers → and change any of them.