Asked by Jenni

A train is moving 50km/h east. A person is walking 5 km/h west on the train. How fast is the person on the train going relative to an observer on the earth?
Answered by drwls
45 km/h east
Answered by drwls
Because
person's velocity with respect top land =
Person's velocity with respect to train + train's velocity with rsepect to land.

= -5 + 50

The minus sign of the first term is there because the person is walking opposite to the train's direction.
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