why do motor vehicles and trains slow down when going uphill? Q and A

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agent yo'range

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Feb 20, 2026, 7:50:20 PM (9 hours ago) Feb 20
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we have seen big trucks slow from 70 mph to 50 mph on hills on
interstetes - why dont they slow to 25 mph or 10 mph? must have
something to do with horsepower - whats the relationship[ between HP
and grade?
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