(a)[3]
Determine the power of the car’s engine at point $A$.
(b)[3]
Show that the distance $AB$ works out as $1362.6\,\text{m}$.
Mathematics 9709 · AS & A Level · Energy, work and power
Energy, work and power — practice question
A car with mass $1200\,\text{kg}$ is moving on a straight horizontal road $AB$. A constant resisting force of size $500\,\text{N}$ acts on it. When the car goes through point $A$, its speed is $15\,\text{m s}^{-1}$ and its acceleration is $0.8\,\text{m s}^{-2}$. While it travels from $A$ to $B$, the car keeps working at this power. It takes $53$ seconds for the journey from $A$ to $B$, and the car’s speed at $B$ is $32\,\text{m s}^{-1}$.