(i)[3]
Find the numerical value of $P$.
(ii)[2]
Determine the car’s acceleration at this point.
Mathematics 9709 · AS & A Level · Energy, work and power
Energy, work and power — practice question
A car with mass $1400\text{ kg}$ travels along a horizontal straight road. The resistive force opposing the car’s motion is constant at $800\text{ N}$, and the engine power stays constant at $P\text{ W}$. At the moment when the car’s speed is $18\text{ m s}^{-1}$, its acceleration is $0.5\text{ m s}^{-2}$. The car then goes on to another point where its speed is $25\text{ m s}^{-1}$.