A Walker is on a train moving 10 mph on top of a train that is moving in the opposite direction at 40 mph. Relative to the Stationary bystander the Walker on the train seems to have the velocity of ...

The train is moving 40 mph

The walker is moving 10 mph the opposite direction

The bystander isn't moving.

# What does the bystander see?

- Posted:
- 3+ months ago by CriticalF...
- Topics:
- train, moving, direction, walker, bystander, stationary, relatives, relative

Details:

## Answers (1)

If you nominate train direction as +ve velocity, then the Walker being the opposite direction has to be -ve velocity. (Velocity is a speed with direction).

So add velocities in mph of the train, walker & bystander +40+(-10)+0 = 40-10=30

So the Walker passes the bystander at 30mph