A car of mass \(1800\text{ kg}\) is towing a trailer of mass \(400\text{ kg}\) along a straight horizontal road. The car and trailer are connected by a light rigid tow-bar. The car is accelerating at \(1.5\text{ m s}^{-2}\). There are constant resistance forces of \(250\text{ N}\) on the car and \(100\text{ N}\) on the trailer.
- Find the tension in the tow-bar. [2]
- Find the power of the engine of the car at the instant when the speed is \(20\text{ m s}^{-1}\). [3]