# A metro train starts from rest and in five seconds achieves   After that it moves with constant velocity and comes to rest after travelling 45 m with uniform retardation.  If total distance travelled is 395 m, find total time of travelling 1) 12.2 s 2) 15.3 s 3) 9 s 4) 17.2 s

## Question ID - 100378 :- A metro train starts from rest and in five seconds achieves   After that it moves with constant velocity and comes to rest after travelling 45 m with uniform retardation.  If total distance travelled is 395 m, find total time of travelling 1) 12.2 s 2) 15.3 s 3) 9 s 4) 17.2 s

3537

Answer Key : (4) -

Given,

From first equation of motion.

Or

So, distance travelled by metro train in 5 s

Distance travelled before coming to rest

So, from third equation of motion

Or

Time taken in travelling 45 m is

Now, total distance

Or

Hence, total time taken in whole journey

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