Final answer:
The displacement of the particle is 150 m.
Step-by-step explanation:
The displacement of a particle moving in a straight line at a constant velocity can be calculated by multiplying the velocity by the time interval. In this case, the velocity is 30 m/s and the time interval is 5.0 s. So, the displacement is 30 m/s * 5.0 s = 150 m.