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A 800 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then
A) The net accelerating force is 30000 N
B) The acceleration of the train is 3.5ms^-2
C) The force of wagon 1 on wagon 2 is 28000 N

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B,C are correct

A, C are correct

All are correct

A,B are correct

answer is C.

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Detailed Solution

$ΣF = ma \Rightarrow F_{ext} - f = ma$

$\Rightarrow 40000 - (5000) = (5 \times 2000) a \Rightarrow a = 3 .5 m / s^{2} Also {ΣF}_{1} = m_{1} a_{1} \Rightarrow 40000 - N_{1} - 5000 = (2000) (3 .5) \Rightarrow 35000 - N_{1} = 7000 \Rightarrow N_{1} = 28000 N$

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