If the girl is running along a straight road with uniform velocity, it means her velocity is constant and not changing. In this case, her acceleration is zero.
Acceleration is defined as the rate of change of velocity over time. Since the girl's velocity is constant at 1.5 m/s, there is no change in velocity, and therefore her acceleration is zero.
It's important to note that uniform velocity implies no acceleration, as the object is moving at a constant speed in a straight line without any change in direction or speed.