Can someone me with these questions?

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

What is the measure of a change in an objects velocity?

The graph represents the distance a car travels over time while on the highway. which statement about the car's trip is accurate? a) the car does not move over time. b) the car travels at a constant velocity. c) the car's velocity increases constantly over time. d) the car's velocity decreases constantly over time.