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An objecte of mass 5 kg falls from rest through a vertical distance of 20 m and reaches velocity 10 m/s. How much work is done by push of air on the object $(g=10 m/s^2)$

\[(a)\;120\;J\quad (b)\;-750\;J \quad (c)\; -450\;J \quad (d)\;250\; J\]

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