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a. Explain what is meant by work.

b. i. Explain how the principle of conservation of energy applies to a man sliding from rest down a
vertical pole, if there is a constant force of friction acting on him.

ii. The man slides down the pole and reaches the ground after falling a distance h = 15 m. His potential energy at the top of the pole is 1000 J. Sketch a graph to show how his gravitational potential energy E, varies with h. Add to your graph a line to show the variation of his kinetic energy Ex with h.

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