Question

179. A train is moving towards East with a speed 20 m/s.
A person is running on the roof of the train with a
speed 3 m/s against the motion of train. Velocity of
the person as seen by an observer on ground will
be :
answer is 23 m/s towards east ​

Answer 1

Explanation:

Since the unit vector ˆi represents direction towards east, we observe the velocity of person as seen by the observer towards east. Therefore, we can see that the velocity of the person running over the roof of the train is 17 m/s towards East as seen by the observer on the ground. So, the correct answer is option (B).

now plz plz plz answer my questions...