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A bus decrease its speed from 80 km h^(-...

A bus decrease its speed from `80 km h^(-1)` to `60 km h^(-1)` in 5 sec. Find acceleration of the bus.

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Initial velocity,
`u=80` km/h
`=(80000)/(3600)=22.22" ms"^(-1)`
Final velocity,
`v=60` km/h
`v=(60000)/(3600)=16.66" ms"^(-1)`
Time, `t=5s`
`a=(v-u)/(t)`
`=((16.66-22.22)"ms"^(-1))/(5s)`
`=-1.11" ms"^(-2)`
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