Question

A metro train starts from rest and in 5 s achieves 108 km/h.
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.
(a) 12.2 s (b) 15.3 s
(c) 9 s (d) 17.2 s

Answer 1

Answer:

=> Here, After that it moves with constant velocity and comes to rest after travelling 45 m with uniform retardation and total distance travelled is 395 m. => After travelling the distance of 45 m with uniform retardation a , metro comes to rest . Hence, total time of travelling is 17.16 seconds.

Answer 2

Answer:

The correct answer is (d) is 17.2 which is a round off of 17.16 seconds.

Explanation:

Here, After that it moves with constant velocity and comes to rest after travelling 45 m with uniform retardation and total distance travelled is 395 m. => After travelling the distance of 45 m with uniform retardation a , metro comes to rest . Hence, total time of travelling is 17.16 seconds.