KE=1/2 x mass x speed^2 Substitute: KE=1/2 x 100 x 10000^2 5000000000J of KE So either 5 gigajoules Or 5x10^9J

Kinetic Energy = (1/2) (mass) (speed squared) Mass = 100 kg Speed = 10 km/s = 10,000 m/s Speed squared = 100,000,000 m²/s² 1/2 (M)(V²) = 1/2 (100) (100,000,000) = 5,000,000,000 joules (5 x 10⁹ J) That's 5 billion joules. That's the amount of energy a 100-watt light bulb uses in 579 days.