Posted by **Harold** on Wednesday, March 4, 2009 at 11:45pm.

A 1500 kg truck travels at 30m/s. It faces a force of 400 N from air resistance, what is the car's average power output?

Is the answer 675 kw?If not please help me in any way you can,by showing the formula you used.

- Physics -
**drwls**, Wednesday, March 4, 2009 at 11:58pm
Regardless of the weight of the truck, the average power on a level road is wind resistance x velocity (neglecting engine piston and rolling friction, and transmission losses). That number is 30 x 400 = 12,000 W

At that speed (67 mph), overcoming air resistance is where most of the power goes. 400 N (about 100#) sounds rather low for the air resistance of a truck at that speed.

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