A) 58 s
B) 68s
C) 78 s
D) 88 s
Correct Answer: D
Solution :
Key Idea: Total distance covered by train is sum of trams length plus length of bridge. Total time taken by train to cross the bridge \[k=[{{M}^{0}}{{L}^{-1}}{{T}^{0}}]\] Total distance = Length of train + Length of bridge \[\Delta \,{{D}_{1}}=1.006-mean\] Velocity of train = 45 km/h \[=1.006-1.004\] \[=0.002cm\] \[K=\frac{1}{2}m{{v}^{2}}\]
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