Final answer:
An acceleration of +5.0 m/s² indicates that an object's velocity is increasing by 5.0 meters per second every second in a positive direction, typically to the right or upwards.
Step-by-step explanation:
An object with an acceleration of +5.0 m/s² means that its velocity is increasing by 5.0 meters per second every second in the positive direction, which is often interpreted as moving to the right or upwards, depending on the context of the coordinate system. Because acceleration is velocity in m/s divided by time in s, the SI units for acceleration are m/s². If we apply this acceleration to an example, a train starting from rest with this acceleration would end up moving to the right with ever-increasing velocity. In general, the plus sign for acceleration indicates that the object's acceleration is in the same direction as the increase in velocity.