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    phys_08 Posts: 22, Reputation: 2
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    #1

    Feb 15, 2010, 10:47 PM
    Acceleration and Newtons laws with Mass
    A 5.0Kg stone is sinking in water at a constant speed of 5.0m/s what is the upward force of water on the stone?
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    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 16, 2010, 07:40 AM

    Remember that F = ma. If an object falls at a constant rate, then the acceleration = 0. Hence the force upward on the stone (due to resistance of the water) is equal to the force downward (due to gravity).

    Can you take it from here?

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