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An automobile engine exerts a
force of 595 N to propel the car at 90.0 km/h on a level road. What is the power output of the engine at
that time?
It's exactly enough to replace the energy lost to friction and air resistance. We have no information with which to evaluate those.
Without friction and other losses, it takes no force and no power to keep a car moving at any speed in a straight line.
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