Question

State with reasons,if it is possible or impossible ,for an object in motion to have:acceleration opposite to the direction of motion.

Answer 1

I will say yes.
It can have opposite acceleration
Or retardation. If you throw a ball upward then it have negative acceleration that is gravitational force which helps the ball to come back to rest and bringing ball back to you. Hope u understand ask if any doubt

Answer 2

Answer:

If an object is slowing down, then its acceleration is in the opposite direction of its motion. This general principle can be applied to determine whether the sign of the acceleration of an object is positive or negative, right or left, up or down, etc.

a thanks will do it.