Answer:
To find the acceleration of the bus, we can use the formula for acceleration:
\[ a = \frac{{v_f - v_i}}{{t}} \]
Where:
- \( a \) is the acceleration
- \( v_f \) is the final velocity (60 km/h in this case)
- \( v_i \) is the initial velocity (80 km/h in this case)
- \( t \) is the time interval (5 seconds in this case)
Substitute the given values into the formula:
\[ a = \frac{{60 - 80}}{{5}} \]
\[ a = \frac{{-20}}{{5}} \]
\[ a = -4 \, \text{km/h}^2 \]
So, the acceleration of the bus is \( -4 \, \text{km/h}^2 \) (negative because the bus is decelerating).
