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Find the work done by the force pulling the box.
Mathematics 9709 · AS & A Level · Energy, work and power
Energy, work and power — practice question
A box of mass $25\,\text{kg}$ is pulled $12\,\text{m}$ along a rough plane inclined at $8^\circ$ to the horizontal. It travels up the line of greatest slope while opposing a frictional force of $50\,\text{N}$. The pulling force acts parallel to the line of greatest slope. The box begins from rest and reaches a speed of $2.4\,\text{m s}^{-1}$ after the $12\,\text{m}$.
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This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Potential energy change given by $PE=\pm 25g\times 12\sin 8$ or an equivalent expression.” …
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