Question

you are riding on a train traveling 80 km/h. if you walk toward the back of the train at a speed of 1.2 km/h relative to the train, what is your velocity relative to the ground?

Answer 1

Velocity of the passenger = 78.8[km/h]

Step-by-step explanation:

In order to solve this problem, we must observe the train from a distant point of the train. In this way we can observe that the train moves at 80[km/h] relative to the ground.

In such a way that the passenger moves in a direction contrary to the movement of the train.

`v_(pass)=80-1.2\\ v_(pass)=78.8[km/h]`

The Observer located outside the train will see how the passenger moves away at 78.8 [km / h] and not at 80[km/h] which is the speed of the train.