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Originally Posted by kennybobby Southern Squidbillie
Your vertical speed is not at the same speed as your horizontal rate, but you are moving up away from the center of the earth, and you are fighting gravity with a force equal to the entire weight of your vehicle. To climb a 5% incline at a constant speed requires twice as much power at 65 mph as just moving on flat land. How do you make more power--you burn more fuel. Hope this helps, i can supply the maths if you desire a numerical explanation.
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Bingo. It's why when you collide two locomotives head-on, they go up; away from the center of the Earth.
