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If a train travelling at 72 mkh ^-1 is t...

If a train travelling at `72 mkh ^-1` is to be brouhgt to rest in a distance 200 m, then its retardation should be

A

`20 ms^-2`

B

`10 ms^-2`

C

`2 ms^-2`

D

`1 ms^-2`

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