Question

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

A

2.22m/s2

B

2.11 m/s2

C

1.11 m/s2

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=v−ut =600−80036×5=−1.11ms−2 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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