February 25, 2017

Homework Help: 12th grade

Posted by Anonymous on Tuesday, November 2, 2010 at 5:52pm.

You're riding on a train that's moving at 50 km/h, and you roll a ball down the aisle at 2 km/h in the same direction as the train is moving. If a person standing on the ground near the train track could see the ball, how fast would it appear to be moving?

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