CBSE Class 11-science Answered
Two train the moving on the same track. the velocity of first train and 72 km/h and the second is 36 km/h. If the 1st train behind the 2nd train, then the minimum distance between the trains such that they do not collide ( retardation of brakes of 1st train is 0.05 m/s^2)
1) 1000m
2) 500m
3) 100m
4) 3000m
Asked by kamlesh.chahal.2003 | 20 Jul, 2019, 06:09: PM
Expert Answer
speed of first train = 72 km/hr = 72×(5/18) m/s = 20 m/s
speed of second train = 36 km/hr = 36×(5/18) = 10 m/s
since the first train is behind second train, it has to reduce its speed 20 m/s to 10 m/s or
less than 10 m/s in order not to collide with the second train.
distance S required to reduce the speed is obtained from the equation, v2 = u2 - (2 a S) ,
where v is final speed , u is initial speed and a is retardation
Hence distance S required for first train to reduce the speed = ( 202 - 102 )/(2×0.05) = 3000 m
time taken to reduce the speed = (v-u)/a = (20-10)/0.05 = 200 s
distance travelled by second train in 200 s = 10×200 = 2000 m
Hence required distance to be kept between first and second train to prevent collision = ( 3000 - 2000 ) m= 1000 m
Answered by Thiyagarajan K | 21 Jul, 2019, 11:42: AM
CBSE 11-science - Physics
Asked by sheikhsaadat24 | 17 Apr, 2024, 09:41: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by sy123946 | 07 Apr, 2024, 04:23: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by derhebha955 | 03 Apr, 2024, 09:03: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by sumedhasingh238 | 29 Mar, 2024, 05:15: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by sumedhasingh238 | 28 Mar, 2024, 11:10: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by roshnibudhrani88 | 23 Mar, 2024, 05:52: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by emad.amd | 21 Mar, 2024, 12:00: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by vinitdubey7735 | 14 Mar, 2024, 11:21: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by om636694 | 04 Mar, 2024, 09:10: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by rajuinwati12 | 04 Mar, 2024, 09:22: AM
ANSWERED BY EXPERT