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The driver of a train travelling at 115 ...

The driver of a train travelling at 115 km/hour sees on the same track 100 m in front of him a slow train travelling in same direction at 25 km/hr. The least retardation that must be applied to the faster train to avoid a collision will be-

A

`25 ms^(-2)`

B

`50 ms^(-2)`

C

`75 ms^(-2)`

D

`3.125 ms^(-2)`

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