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Quebec Class 5 Practice Test
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Passing target: 75% in each of the three areas
Observation, Speed & SpaceStandalone practice
For the same vehicle mass, what happens to kinetic energy when speed doubles?
Correct answer: It becomes four times as great.
Why
For the same vehicle mass, doubling speed multiplies kinetic energy by four. The brakes must dissipate that extra energy to stop the vehicle, and a collision can be more severe. This relationship is about one vehicle's speed and mass; it is not a rule for simply adding the speeds of two colliding vehicles.
Verified against Driving a Passenger Vehicle · Observation, speed and space · p. 79
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