The 100-m dash can be run by the best sprinters in 10.0s. A 60-kg sprinter accelerates uniformly for the first 30m to reach her top speed, which she maintains for the remaining 70m. (a) what is the horizontal component of force exerted on her feet by the ground during the acceleration? (b) what is the speed of the sprinter over the last 70m of the race (i.e , her top speed) (a) = 170N i jux do not get question a, can u guyz tell me wt formula i should use so that i can solve a????