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Question

A bus decreases its speed from 80 km/hr to 60 km/hr in 5 sec. Find the deceleration of the bus.



Your Answer
A

2.22m/s2

Your Answer
B

2.11 m/s2

Correct Answer
C

1.11 m/s2

Your Answer
D

m/s2


Solution

The correct option is D

1.11 m/s2


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. So, the deceleration is 1.11 m/s2.

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