Velocity , both , or acceleration? ?
1. a rate of change
2. unit m/s
3. unit m/s^2
4. can be positive or negative
5. change in velocity over change in time
6. change in displacement over change in time

Acceleration is the rate of change and is constantly positive

The answers for Acceleration:
m/s^2
Change in velocity over change in time

Velocity is the speed of the object but also involves direction can be both negative and positive

The answers for Velocity:
m/s
Can be positive or negative
Change in displacement over change in time

Both Acceleration and Velocity:
A rate of change