Bigger people are usually heavier and therefore will need alot more power to achieve equivalent speeds of smaller lighter people.
It is all to do with power to weight ratios and aerodynamics (wind resistance).
It does not change the actual speed of a vehicle but changing tire size can affect the accuracy of the speedometer.
The larger the tire the faster the vehicle will go for every revolution of the wheel.
Yes
-- mass of the vehicle -- speed of the vehicle
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It affects you because you're an idiot.
It would affect its speed because the weight of the car is gonna slow it down
The higher the wind speed, the bigger the particle size.
A heavy vehicle can go just as fast as a light vehicle, it just takes longer and more HP to reach desired speed with a heavier vehicle.
Kinetic energy.
Air resistance.