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22 March, 13:31

Alex works at a legal firm which produces a lot of documents. Often Alex has to carry heavy stacks of documents from one office to another. On this particular day Alex, who weighs 75 kilograms, has to transport a stack of documents which weighs 10 kilograms. He has to lift them 5 meters from the floor and then carry them to an office 100 meters down the hall, where he will drop them on the floor. Alex walks swiftly at a steady rate of 1 meter per second. If you were going to compute the momentum of Alex and the papers as he carries them down the hall, what three pieces of information given in the description on the previous page would you need to use?

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  1. 22 March, 14:05
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    P=mv or momentum=mass*velocity

    mass=alex+papers=75kg+10kg=85kg

    velocity=1 m/s

    85 kg*1 m/s=85 kgm/s (N/s)
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