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

Question

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

1) 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?

m/s east

2) 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?

m/s east

3) Your friend is sitting on another train traveling 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?

m/s east

Please Show Work and Explain!

Explanation / Answer

1) The velocity gets added up, so, velocity = 17+3.9 = 20.9 m/s

2) The velocity gets subtracted, so, velocity = 17-2.8 = 14.2 m/s

3)14.2 - 14 = 0.2 m/s east

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