How does vehicle gross weight (laden mass) affect the kinetic energy and stopping distance of a heavy truck?

1. Kinetic energy is directly proportional to vehicle mass; a fully loaded 40-tonne truck carries more than 10 times the kinetic energy of an empty 4-tonne truck at the same speed
2. Gross weight has no effect on kinetic energy or braking requirements
3. Heavier trucks stop in shorter distances because extra weight pushes tyres harder into the asphalt
4. Stopping distance decreases by 50% when the vehicle is loaded to maximum payload