Two electric trains A and B leave the same station on parallel lines. The train A starts from rest with a uniform acceleration of 0.2 m/s2 and attains a speed of 45 km.p.h., which is maintained constant afterwards. The train B leaves 1 minute after with a uniform acceleration of 0.4 m/s2 to attain a maximum speed of 72 km.p.h., which is maintained constant afterwards. When will the train B overtake the train A ?
Answers
Answered by
28
Answer:
Train B will overtake Train A after 2.74 min of start
Explanation:
As we know that train A is moving with uniform acceleration a = 0.2 m/s/s
It starts from rest and reached to its maximum speed of 45 kmph
so we have
time to reach this speed is given as
distance covered by the train in such time
Now train B start 1 min after train A with acceleration a = 0.4 m/s/s
Its maximum speed is 72 kmph
so we will have
now time to reach this speed
distance covered by train B in this time
now let say t second after this train B overtake train A
so we will have
total time of motion for train A is (t + 60) s
So train B will overtake train A after
#Learn
Topic : kinematics
https://brainly.in/question/10182826
Similar questions