If the object undergoes a change in velocity from +1 m/s to +4 m/s, its velocity is becoming more positive. This means that the magnitude of the velocity vector increased (from 1 to 4) while the direction of the vector remains the same as the positive direction of a coordinate axis.

If the magnitude of the velocity vector had *decreased* while its direction remained the same as the positive direction of the coordinate axis, then velocity would have become *less* positive.

The acceleration is positive because it is equals to the *change *of the velocity in a unit of time:

`a =(V_2-V_1)/(t_2-t_1)`

Since the change in velocity is positive: 4 - 1 = 3, the acceleration is positive.

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