You are on a train traveling east at speed of 18 m/s with respect to the ground.

Question

You are on a train traveling east at speed of 18 m/s with respect to the ground.

1)If you walk east toward the front of the train, with a speed of 4 m/s with respect to the train, what is your velocity with respect to the ground?
2)If you walk west toward the back of the train, with a speed of 3.5 m/s with respect to the train, what is your velocity with respect to the ground?
3)Your friend is sitting on another train traveling west at 27 m/s. As you walk toward the back of your train at 3.5 m/s, what is your velocity with respect to your friend?

Explanation / Answer

If you are on a train traveling east at a speed of 18 m/s, and walk to the front of the train with a speed of 2.5 m/s then your velocity with respect to the ground is still the original 18 m/s. It only changes in regards to the train.

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