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}
Answer : option (D)
Solution :
If a train travelling at 72 kmph is to be brought to rest in a distance of 200 metres, then its retardation should be
with
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