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gaobo9109
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Homework Statement
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.
Homework Equations
Newton's three laws
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/s2
However, the answer given is 0.61m/s2
Can anyone tell me where did I go wrong? Thanks