(main)[5]
Calculate the work done by the van’s engine during its descent.
Mathematics 9709 · AS & A Level · Energy, work and power
Energy, work and power — practice question
A van with mass $2500\,\text{kg}$ moves down a hill of length $0.4\,\text{km}$ that is inclined at $4^\circ$ to the horizontal. A constant resistive force of $600\,\text{N}$ acts, and the van’s speed rises from $20\,\text{m s}^{-1}$ to $30\,\text{m s}^{-1}$ during the descent.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “An attempt to find the gain in KE and loss in PE: $\tfrac12\times2500(30^2-20^2)$ and $2500g\times400\sin4$” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI