6 Fig. 6 shows a train consisting of an engine of mass 80 tonnes pulling two trucks each of mass 25 tonnes.
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\caption{Fig. 6}
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The engine exerts a driving force of \(D \mathrm {~N}\) and experiences a resistance to motion of 2000 N . Each truck experiences a resistance of 600 N . The train travels in a straight line on a level track with an acceleration of \(0.1 \mathrm {~ms} ^ { - 2 }\).
- Complete the force diagram in the Printed Answer Booklet to show all the forces acting on the engine and each of the trucks.
- Calculate the value of \(D\).
- The tension in the coupling between the engine and truck A is larger than that in the coupling between the trucks. Determine how much larger.