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
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 | SaraNextGen Answer
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
|
A metro train starts from rest and in five seconds achieves |
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|
1) |
12.2 s |
2) |
15.3 s |
3) |
9 s |
4) |
17.2 s |
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
