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During one extension of the spring, its length increases from 70 cm to 90 cm. The average force exerted by the athlete is 400 N.

During one extension of the spring, its length increases from 70 cm to 90 cm. The average force exerted by the athlete is 400 N.

(i) Calculate the work done by the athlete in one extension.

(ii) Determine his average power during the 60 s.

(iii) Calculate the value of the spring constant for this spring.

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