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You decide to start training to become a faster sprinter. On day 1, you timed your...

You decide to start training to become a faster sprinter. On day 1, you timed your 100m dash and your final time was 18 seconds. After training for a month, on day 30, your final time was 15.5 seconds. Assume your overall mass of 65kg and your % leg mass (17%) remained constant. (a) Calculate the difference in your average kinetic energy. (b) If you apply 350N of force on the ground in the horizontal direction with every step, determine your stride length if your final velocity at the finish line on day 2 was 7.5 m/s.

I was able to answer part (a) but don't know how to solve part (b)

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