12. If rain drop move decreasing acceleration, does work done by gravitational force on
the drop change?
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Explanation:
It falls with decreasing acceleration (due to viscous resistance of the air) until at half ... it attains its maximum (terminal) speed and moves with uniform speed there after. What is the work done by the gravitational force on the drop in the first and ... done by all the forces (external and internal) on a system equals the change
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