Final answer:
The velocity of a car with constant acceleration is determined by the formula v = vo + at, not just v = a + t; the initial velocity must also be considered. None of the options provided is entirely accurate, but option (c) is the closest when initial velocity is zero.
Step-by-step explanation:
The car's velocity (v) and acceleration (a) are related by physics equations which describe motion. When a car travels on a straight track and has a constant acceleration, the relationship between velocity and time is linear. This is represented by formula v = at + vo, where vo is the initial velocity (which can be zero if the car starts from rest) and t is the time. Given the provided options, none exactly match the correct relationship. If the acceleration is constant, the correct relationship is closest to option (c) v = a + t, but it must be noted that the initial velocity must be included as well, and the correct equation should have the format of v = vo + at.