In the context of classical mechanics, as described by Newtonian physics, a car (or any object with mass) cannot reach the speed of light, no matter how much its speed increases over time.
According to Albert Einstein's theory of special relativity, the speed of light in a vacuum, denoted by "c," is an absolute constant and is approximately 299,792,458 meters per second (approximately 186,282 miles per second). One of the fundamental postulates of special relativity is that the speed of light is the same for all observers, regardless of their relative motion.
As an object with mass accelerates, its speed will increase, but it will require an infinite amount of energy to reach the speed of light. As an object approaches the speed of light, its mass would increase as well, and the energy required to accelerate it further would become infinite. This means that an object with mass cannot reach or exceed the speed of light.
Additionally, as an object's speed approaches the speed of light, time dilation effects come into play, causing time to slow down relative to a stationary observer. These effects become significant as the object approaches the speed of light, making it impossible to reach or surpass that speed.
So, hypothetically speaking, a car or any other object with mass cannot obtain the speed of light in a vacuum, no matter how much its speed increases over time, according to our current understanding of physics. The theory of special relativity is well-supported by experimental evidence and has been extensively verified over the years.