1/2*(0.5oz)*(15000mph)^2 = 319 kilojoules of (kinetic) energy 1/2*(1,955 lbs)*(60mph)^2 = 319 kilojoules of (kinetic) energy So it's basically the same amount

1/2*(0.5oz)*(15000mph)^2 = 319 kilojoules of (kinetic) energy 1/2*(1,955 lbs)*(60mph)^2 = 319 kilojoules of (kinetic) energy So it's basically the same amount of energy as a car at highway speed. But, you'd need to concentrate all of the mass as a small point in order to cause that sort of hole.