Question

give one example of the motion when acceleration in plus when acceleration in minus when acceleration is zero

Answer 1

positive acceleration= when a car is starting to move from its state of rest

negative acceleration(deceleration)=when a car is applying brakes to stop

zero acceleration=when an object with travelling in a highway with constant velocity

Answer 2

when we accelerate a vehicle then acceleration is plus.
when we apply brakes to vehicle then acceleration is minus.
when there is no motion of vehicle, then acceleration is zero.