To determine the acceleration of a bus, we need to know the change in velocity and the time it takes for that change to occur. However, if we only have the initial speed, we cannot directly calculate the acceleration. Additional information is required.
Acceleration is defined as the rate of change of velocity over time. If we have the initial and final velocities, we can use the following formula to calculate acceleration:
acceleration = (final velocity - initial velocity) / time
Without the final velocity or the time, it is not possible to determine the acceleration based solely on the given information of the bus traveling at a speed of 72 km/h.