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Question

A bus decreases its speed from 80 km h-1 to 60 km h-1 in 5s, find the acceleration of the bus.

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Solution

Step 1: Given data

Initial velocity, u=80 km h-1=22.2 ms-1

Final velocity, v=60 km h-1=16.7 ms-1

Time, t=5s

Step 2: Formula used

v=u+at

Where “a” is the acceleration.

Step 3: Determine the acceleration

Using the first equation of motion,

v=u+at 16.7=22.2+a(5) a=16.7-22.25 a=-1.1 ms-2

The value is negative as the bus is decelerating

Therefore, the acceleration of the bus is -1.1 ms-2


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