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On a bus traveling north at 20.0m/s, a child stands up and walks towards the back of
the bus at 1.3m/s. What is the child's resultant velocity?

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Explanation:

Taking north to be positive:

v = 20.0 m/s − 1.3 m/s

v = 18.7 m/s

The resultant velocity is 18.7 m/s north.

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