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soooooo... i think i got it.. D=m*g/s=5*10/0.1=500 sigma=F/v = 2N/0.04m/s=50 right?

Homework Statement A mass m of 5 kg stretches a spring about 0.1m. This system is placed in a viscous fluid. Due to the fluid a braking force of 2N acts on the mass if the velocity is 0.04m/s. For the acceleration of gravity we can assume g = 10m/s^2. Set up from the balance of forces...