# If a train travelling at 72 kmph is to be brought to rest in a distance of 200 metres, then its retardation should be

Question : If a train travelling at 72 kmph is to be brought to rest in a distance of 200 metres, then its retardation should be

(A) $20ms^{-2}$

(B) $10ms^{-2}$

(C) $2ms^{-2}$

(D) $1ms^{-2}$