Posted by Mary on Wednesday, September 23, 2009 at 3:18am.
Apply Newton's second law, F = M a, to the trailer to get the towing force on the trailer. In this case, M will be the mass of the trailer.
The same force will be applied to the car by the trailer.
Since you know the car is accelerating at the same rate, use F = Ma for the net force on the car. In this case, M is the mass of the car.
I am not going to answer any more of your questions unless you show some work of your own. Perhaps someone else will help; perhaps not.
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