A sprinter explodes out of the starting block with an

Question

Solve the given parts of following problem:

Problem: A sprinter explodes out of the starting block with an acceleration of + 2.34 m/s², which she sustains for 1.27 s. Then, her acceleration drops to zero for the rest of the race.

Part A: What is her velocity at (a)t = 1.27 s?

Part B: What is her velocity at the end of the race?

Please explain each step and equations used for above problem.