(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A train consists of a 4000 kg locomotive pulling two loaded boxcars, the ﬁrst with a mass of 12,000 kg and the second with a mass of 16,000 kg. Assume that the boxcar wheels roll without friction and ignore aerodynamics. The acceleration of the train is 0.4 m/s2.

With what force strength, in Newtons, does the ﬁrst boxcar pull on the last boxcar?

2. Relevant equations

F=ma

3. The attempt at a solution

I thought the mass should be the total of the last two boxcars which would be 12000 plus 16,000 =28,000 so I tried 28,000*0.4m/s^2 which came out to 11,200 which is obviously wrong the answer to the question should be 6E3, what am I doing wrong?

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# Train Moving pulling two boxcars

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