Question

A sprinter explodes out of the starting block with an acceleration of +2.31 m/s², which she sustains for 1.50 s. Then, her acceleration drops to zero for the rest of the race. What is her velocity at (a)t = 1.50 s and (b) at the end of the race?

Answer 1

$(a)\space v(1.5)=2.31·1.5=3.465\text{ m/s}.\\ (b)\space v(\text{end})=0.$