# 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

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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  Next Question :
 A small particle of mass is projected at an angle with the -axis with an initial velocity in the - plane as shown in the figure. the angular momentum of the particle is 1) 2) 3) 4)  