\includegraphics{figure_17}
A car and caravan, connected by a tow bar, move forward together along a horizontal road.
Their velocity \(v\) m s\(^{-1}\) at time \(t\) seconds, for \(0 \leq t < 20\), is given by
$$v = 0.5t + 0.01t^2$$
- Show that when \(t = 15\) their acceleration is 0.8 m s\(^{-2}\)
[2 marks]
- The car has a mass of 1500 kg
The caravan has a mass of 850 kg
When \(t = 15\) the tension in the tow bar is 800 N and the car experiences a resistance force of 100 N
- Find the total resistance force experienced by the caravan when \(t = 15\)
[2 marks]
- Find the driving force being applied by the car when \(t = 15\)
[3 marks]
- State one assumption you have made about the tow bar.
[1 mark]