What is the Upward Force of Water on a Sinking Stone?

[john411]

Homework Statement

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?

Homework Equations

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

The Attempt at a Solution

i found out Fnet is 10.5 because of Fnet= (3.0)(3.5)

 

[rock.freak667]

there is the upward force and the weight acting. The resultant of those two give the net force

 

[john411]

there is the upward force and the weight acting. The resultant of those two give the net force

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

 

[Delphi51]

Looks good.