Calculate the force required to pull a copper ball of radius 2.00 cm upward through a fluid at the constant speed 6.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s. Ignore the buoyant force.

Question

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Answer 1

Don't know the density of copper, but if you find it you can get the mass from 4/3 pi r^3 times density.
Now you have an mg force down and the drag force (.06 m/s)(.950 kg/s).
Sum those two and that the force you need to balance.