You are on a train travelling east at speed of 17 m/s with respect to the ground

Question

You are on a train travelling east at speed of 17 m/s with respect to the ground. If you walk east toward the front of the train, with a speed of 3.9 m/s with respect to the train, what is your velocity with respect to the ground? If you walk west toward the back of the train, with a speed of 2.8 m/s with respect to the train, what is your velocity with respect to the ground? Your friend is sitting on another train travelling west at 14 m/s. As you walk toward the back of your train at 2.8 m/s, what is your velocity with respect to your friend?

Explanation / Answer

1) v1 = 17-3.9 = 14.9 m/s

2) v2 = 17+2.8 =19.8 m/s

3) v3 = 17+2.8+14 = 33.8 m/s

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