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#1. When you are going at twice the speed, your service brakes will need to work _________ to stop your vehicle.
The kinetic energy of a moving object increases as the square of the object’s speed. Doubling the speed quadruples the kinetic energy (i.e., multiplies it by four). Brakes use friction to convert the kinetic energy of a moving vehicle into heat. Thus, if you double your vehicle’s speed, you’ll need four times as much braking force to bring your vehicle to a complete stop