Answer:
The statement given by the friend is wrong because when the acceleration of car is in the direction opposite to the car's velocity, car is decelerating which means slowing down.
Step-by-step explanation:
Acceleration is the change of the velocity with respect to time. Acceleration is a vector quantity. If the velocity is decreasing, the acceleration acting on the body is in the opposite direction in which the body is travelling. It means that when the car is travelling towards the east, it can have a negative acceleration of acceleration towards the west when the velocity of the car is decreasing.