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

A train consists of three coaches A,B and C linked together via tow bars. A and C are coaches with engines and have a mass of 10000kg each, while B is an un-powered coach having a mass of 8000kg. The driving force of the engines in A and C are 20000N and 18000N respectively. The drag force on A is 9000N while B and C experiences the same drag force of 6000N.

2. Relevant equations

Newton's three laws

3. The attempt at a solution

I tried to find the net force exerted on coach A by

F(net) = 20000 - 9000 = 11000N

a = 11000/10000 = 1.1m/s^{2}

However, the answer given is 0.61m/s^{2}

Can anyone tell me where did I go wrong? Thanks

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# Homework Help: Question on Newton's law of motion

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