3 ptsC,C1Official number: 11521
How does doubling of the lorry speed influence the length of the braking distance?
Explanation
Correct answer: It increases the braking distance by four times.
According to the laws of physics, the kinetic energy of a vehicle increases proportionally to the square of its speed. This means that doubling the speed results in a fourfold increase in the energy that the brakes must dissipate. As a result, the braking distance increases not twofold, but fourfold.