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Originally Posted by Martian
You can do funny things with that knowledge. For example, if you're riding the train that's going 120 km/h and you throw a ball off the back at 30 km/h, the ball will appear to you to be travelling away from you at 30 km/h. However, to a stationary observer, the ball is actually moving in the same direction as you at 90 km/h.
Velocities are fun stuff.
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or if you throw it at the observer, you can hit him with it at 150 kph (ouch)
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