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

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Answer 1 · 2016-10-30T19:32:51

#"Acceleration of the bus is :"a=-10/9" "m/s#

#"acceleration of an object is described as :"a=(Delta v)/(Delta t)#

#Delta v=60-80=-20(km)/h#

#Delta t=5 s#

Here we are converting the units to #m/s#:

#-20" "(km)/h=-20.000/3600=-200/36=-50/9m/s#

#a=(Delta v)/(Delta t)#

#a=(-50/9)/5#

#a=-cancel(50)/9*1/cancel(5)#

#a=-10/9" "m/s^2#