(a)[2]
Calculate the tension in the tow-bar.
(b)[3]
Calculate the power of the car's engine at the instant when the speed is $20\,\text{m}\,\text{s}^{-1}$.
Mathematics 9709 · AS & A Level · Energy, work and power
Energy, work and power — practice question
A car with mass $1800\,\text{kg}$ is pulling a trailer of mass $400\,\text{kg}$ on a straight horizontal road. The car and trailer are joined by a light rigid tow-bar. The car has acceleration $1.5\,\text{m}\,\text{s}^{-2}$. Constant resistance forces act, with $250\,\text{N}$ on the car and $100\,\text{N}$ on the trailer.