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Physics 23 Online
OpenStudy (anonymous):

A marble with the mass 15,8mg and volume 6,4mm^3 is dropped in a vertical glastube filled with oil with the density 0,88*10^3 kg/m^3. It (the marble) is moving with a constant velocity, v. The force of friction is proportional with the velocity. At 2cm/s, it is 50 μN, 10cm/s, it is 250 μN. Determine the marble's velocity. The answer should be 4cm/s, can someone help?

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