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Find the work done against the resistance opposing the motion of the block.
Mathematics 9709 · AS & A Level · Energy, work and power
Energy, work and power — practice question
A block of mass $15\,\text{kg}$ moves down the line of greatest slope on an inclined plane. The top of the plane is $1.6\,\text{m}$ vertically above the level of the bottom. The block’s speed at the top is $2\,\text{m s}^{-1}$, and at the bottom it is $4\,\text{m s}^{-1}$.
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This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Accurate calculation of kinetic energy at the top or bottom, for example $\tfrac12 \times 15 \times 2^2$ or $\tfrac12 \times 15 \times 4^2$” …
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