Acceleration is a vector it can be happened due to forces of the system. If there is no external force acting on a system. There are no acceleration. If velocity is increasing due to Force its called acceleration If velocity is decreasing its called deceleration
Pascal's law says that pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions.
