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Question

A bus decreases its speed from 80km hr1 to 60km hr1 in 5 seconds. What is the acceleration of the bus?



A

2.22 ms2

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B

2.11 ms2

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C

1.11 ms2

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D

0 ms2

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Solution

The correct option is B

1.11 ms2


Initial speed u=80kmhr=80×100060×60=800m36s

Final speed v=60kmhr=60×100060×60=600m36s

Time taken t=5 s

  a=vut =60080036×5=1.11ms2

Here sign of acceleration is negative which shows that the speed is decreasing and acceleration is in the opposite direction of the motion.


Physics

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