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The speed limit on a highway is 55 mile...

The speed limit on a highway is 55 mile `h^(-1)`. Express this speed in `SI` base units.

A

`25 ms^(-1)`

B

`35 ms^(-1)`

C

`20 ms^(-1)`

D

`30 ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
Use the relations `1 ft = 12 In`.
`1 "mile" = 5280 ft, 1 "in" = 2.54xx10^(-2) m`, and `1 h = 3600 s`
`"mile" rarr ft rarr "in" rarr m` and `h rarr s`
`(55 ("mile")/(h)) ((580 ft)/(1 "mile")) ((12 "in.")/(1 ft.)) ((2.54xx10^(-2) m)/(1 "in")) ((1h)/(3600 s))`
`= 25 m s^(-1)`
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