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/2mv^2 where m is mass and v is velocity. The fuel used is proportional (in a simplified view) to the kinetic energy of the car. Therefore if cars are to driven at the same speed (and ignoring the individual efficiencies of different models) the car that has a larger mass uses more fuel to get to and maintain the same speed

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13y ago
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12y ago

Because Kinetic energy is also based on mass.

the equation is KE=mV^2.

since the truck has greater mass, it will have greater KE at the same speed.

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Q: Why does a large truck have greater kinetic energy than a small car going the same speed?
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