A car is speeding up and has an instantaneous velocity of 1.0 m/s in the + x

Question:

A car is speeding up and has an instantaneous velocity of 1.0 m/s in the + x -direction when a stopwatch reads 10.0 s. It has a constant acceleration of 2.0 m/s2 in the + x -direction.
(a) What change in speed occurs between t = 10.0 s and t = 12.0 s?
(b) What is the speed when the stopwatch reads 12.0 s?