Physics

Problem

An engine of mass

3\,000\,\text{kg}

pulls two identical wagons, each of mass

5\,000\,\text{kg}

, along a horizontal track. If the track offers a total frictional force of

1\,000\,\text{N}

against the motion and the required acceleration of the whole system is

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

, what horizontal force must the engine exert? a)

26\,000\,\text{N}

25\,000\,\text{N}

27\,000\,\text{N}

29\,000\,\text{N}