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It doesn't matter what the car's mass is, or for that matter, what speed you're talking about.
If the total forces opposing its motion are 800 N, then you need to supply 800 N in the direction
of motion in order to maintain a constant speed.

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Q: Driving along a road at a constant velocity of 100km h-1.the forces opposing the motion of the car total 800N. cars mass is 1200kg.what force do you need to maintain constant velocity?
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