Question

Calculate the kinetic energies of a 2000 kg automobile moving at 100 km/h and an 80 kg runner sprinting at 10 m/s

Answer 1

To calculate the kinetic energy of a moving object, you can use the following formula:

KE = 0.5 * mass * velocity^2

For the automobile:

KE = 0.5 * 2000 kg * (100 km/h)^2

= 0.5 * 2000 kg * (27.8 m/s)^2

= 0.5 * 2000 kg * (768.4 m^2/s^2)

= 784,000 Joules

For the runner:

KE = 0.5 * 80 kg * (10 m/s)^2

= 0.5 * 80 kg * (100 m^2/s^2)

= 4,000 Joules

So the automobile has about 196 times more kinetic energy than the runner.