1. The problem statement, all variables and given/known data In a 100 m sprint a runner starts from rest and accelerate to 9.6 m/s [W] in 4.2 s. Calculate acceleration, displacement, and if the runner runs at a constant velocity for the rest of the race what is the total time? 2. Relevant equations 3. The attempt at a solution I am having trouble with the total time. I know acceleration is 2.3 m/s^2 [W] and I know displacement is 20.16 m [W]. However what would the constant velocity be.. Is it 9.6 m/s[w]? And since it states the rest of the race does that mean i have to subtract 20.16 from the 100m?