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Homework Help: Phy 11 Force question

  1. Nov 12, 2009 #1
    1. The problem statement, all variables and given/known data

    A 3.0 kg stone is sinking in water at 3.5m/s(squared) what is the upward Force of the water on the stone?

    2. Relevant equations
    yeahh it seems simple but im very bad at physics so..
    i put M=3.0kg A=3.5m/s (squared)

    3. The attempt at a solution
    i found out Fnet is 10.5 cuz of Fnet= (3.0)(3.5)
  2. jcsd
  3. Nov 12, 2009 #2


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    there is the upward force and the weight acting. The resultant of those two give the net force
  4. Nov 12, 2009 #3
    G-Fwater = ma
    (gxm)-Fwater= ma
    (9.8x3)-Fwater = 3x3.5
    (29.4)- fwater = 10.5
    -Fwater = 10.5 - 29.4
    -Fwater = -18.9
    Fwater = 18.9
  5. Nov 13, 2009 #4


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    Looks good.
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