How does increasing travel speed from 50 km/h to 100 km/h affect the kinetic energy and physical braking distance of a vehicle?

1. Kinetic energy and braking distance increase by four times (quadruple), because energy scales with the square of speed
2. Kinetic energy and braking distance merely double
3. Kinetic energy remains constant while braking distance increases by 10 metres
4. Braking distance decreases because aerodynamic drag assists deceleration