Question

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 your stride length remained roughly 1m per stride, determine the amount of force applied by each foot per stride once you cross the finish line on both days.

I was able to do a but I am not sure how to do part b or even what formula we will need to use

Answer 1