Answer:
-5.55 m/s^2
Step-by-step explanation:
To find the acceleration of the bus, we need to use the formula:
acceleration = (final velocity - initial velocity) / time
Here, the initial velocity of the bus is 80 km/hr, the final velocity is 60 km/hr, and the time taken to change the speed is 5 seconds.
First, we need to convert the speeds from kilometers per hour to meters per second, so that we can use the SI unit of acceleration, which is meters per second squared (m/s^2).
80 km/hr = 80 x 1000 m/3600 s = 22.22 m/s
60 km/hr = 60 x 1000 m/3600 s = 16.67 m/s
Now we can substitute the values into the formula:
acceleration = (final velocity - initial velocity) / time
acceleration = (16.67 m/s - 22.22 m/s) / 5 s
acceleration = -5.55 m/s^2
Therefore, the acceleration of the bus is -5.55 m/s^2.
Note that the negative sign indicates that the acceleration is in the opposite direction of the initial velocity.