physics

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You are on a train traveling east at speed of 17.0 m/s with respect to the ground.
1) If you walk east toward the front of the train, with a speed of 1.1 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 3.1 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 17.0 m/s. As you walk toward the back of your train at 3.1 m/s, what is your velocity with respect to your friend?
4) Below is some space to write notes on this problem

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