A 70-kg skater pushes off the wall of a skating rink, acquiring a speed of 4 m/s.

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A 70-kg skater pushes off the wall of a skating rink, acquiring a speed of 4 m/s.

(a) How much work is done on the skater?

(b) What is the change in the mechanical energy of the skater?

(c) Discuss the conservation of energy as applied to the skater.

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