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Hi, I am not sure how to solve this, the formula I initially used was not correct. Using energy considerations, calculate the average force (in

Hi,
I am not sure how to solve this, the formula I initially used was not correct.
Using energy considerations, calculate the average force (in N) a 68.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 7.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him. (Enter a number.) 68.25 X N

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