A block of mass $$\(m\)$$ is raised vertically at constant speed. The vertical height gained by the block is $$\(\Delta h\)$$, as shown in Fig. 3.1. Fig. 3.1 Derive an expression, in terms of $$\(m\)$$ and $$\(\Delta h\)$$, for the change in gravitational potential energy $$\(\Delta E_{\mathrm{P}}\)$$ of the block. State the meaning of any other symbols you use.

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