When a car comes to rest, it means it has stopped moving. At that moment, its velocity is zero because velocity is a vector quantity that includes both speed and direction. Since the car has stopped, it no longer has a specific direction of motion, resulting in a zero velocity.
Acceleration, on the other hand, is the rate at which velocity changes. When a car comes to rest, it means it has undergone deceleration or negative acceleration to bring it to a stop. However, at the exact moment the car comes to rest, its acceleration is zero. This is because acceleration is defined as the change in velocity per unit time, and when the velocity is zero, there is no change occurring.
Speed, however, is a scalar quantity that refers to the magnitude of velocity without considering direction. Even though the car has come to rest, it can still have a non-zero speed. This happens because speed only takes into account the numerical value of the velocity, regardless of whether it is positive or negative. So, when a car comes to rest, its speed becomes zero, but its velocity becomes zero and its acceleration becomes zero at slightly different points in time.