Physics

Problem

Three wagons, each of mass

4\,000\,\text{kg}

, are coupled to an engine of mass

6\,000\,\text{kg}

. The train accelerates on a level track at

1.2\,\text{m}\,\text{s}^{-2}

. The track exerts a frictional force of

100\,\text{N}

on every tonne of the train’s mass. What is the horizontal pulling force developed by the engine? (Take

1\,\text{tonne}=1\,000\,\text{kg}

.) a)

25\,200\,\text{N}

21\,600\,\text{N}

23\,400\,\text{N}

19\,800\,\text{N}