10
lesson pretestMultiple Choice

Pretest

Question 10 • Physics I

Four vehicles are traveling on the same road. Which vehicle most likely has the greatest kinetic energy?

Answer
A
a motorcycle traveling at a velocity of 25 meters per second
B
a pickup truck traveling at a velocity of 25 meters per second
C
a compact car traveling at a velocity of 10 meters per second
D
a minivan traveling at a velocity of 10 meters per second

Explanation

Kinetic energy depends on both mass and speed: KE = ½mv². The motorcycle and pickup truck travel at the same speed, 25 m/s, so the heavier pickup truck has greater kinetic energy than the motorcycle. The compact car and minivan travel more slowly at 10 m/s, which makes their kinetic energy lower; therefore, the pickup truck traveling at 25 m/s is the best choice.

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