1. The problem statement, all variables and given/known data Runner A runs at 6.0m/s for 10s. Runner B accelerates from 4.0 m/s to 10.0 m/s steadily in 10s. How far does Runner A go in 10s? How far does Runner B go in 10s? At what time did Runner B pass Runner A if they were both at the same position at t=0? 2. Relevant equations d= v*t, d = 1/2(v1+v2)*t 3. The attempt at a solution Runner A: d = v*t d = (6.0m/s)(10s) d = 60m Runner B: d = 1/2(v1+v2)*t d = 1/2(4m/s+10m/s)*(10s) d = 1/2(14m/s)*(10s) d= 70m so therefore at 10s, Runner B has already surpassed Runner A by 10m. But how would you find when Runner B passed Runner A? Many thanks.