12th grade

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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?

  • 12th grade -

    Please identify the School Subject correctly so the right teacher reads your post.

    Sra

  • 12th grade -

    50 + 2 = 52 km/h

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