A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?

A. +2.0 J
B. +20 J
C. ?2.0 J
D. ?20 J
E. +40 J


Answer: D

Physics & Space Science

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