(Answered) A 60kg sprinter starts from rest and reaches a speed of

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A 60kg sprinter starts from rest and reaches a speed of 8.5m/s in 1.8s. During this time there is negligible air resistance. The sprinter then runs the remainder of the race at a constant 8.5m/s with a resistance force of 52N due to wind.

a) How much power must the runner produce during the acceleration phase?

b) How much power must the runner produce during the constant phase?

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