Magnitude of Force Exerted on 1904kg Car by Road

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To find the force exerted on a 1904kg car pulling a 580.72kg trailer with an acceleration of 2.32m/s^2, the total mass should be considered. The combined mass of the car and trailer is 2484.72kg, and the correct calculation involves multiplying this total mass by the acceleration. Neglecting the trailer's mass would yield an incorrect force value, as the trailer contributes to the overall force required for acceleration. The discussion highlights a misunderstanding of how to apply Newton's second law in this context. Ultimately, the correct approach involves using the total mass for accurate force calculation.
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A 1904kg car is pulling a 580.72kg trailer. Together the car and the trailer have an acceleration of 2.32m/s^2. Neglecting frictional forces acting on the trailer, find the magnitude of the force exterted on the car by the road.

My prof told me to just add the two masses and multiply them the acceleration. The answer was wrong. But since it's only asking about the force regarding the car, could we just neglect the trailer's mass? Wouldn't it just be 1904(2.32)?
 
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I am not a physicist but since trailer isn't self-powered it's just like a heavier car.
 
Nevermind, I figured it out. My prof was way off on this one. Heh.
 
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