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13 A rain drop of radius 2 mm falls from a height of 500 m above the ground. It fallsdecreasing acceleration (due to viscous resistance of the air) until at half its origihaheight, it attains its maximum (terminal) speed, and moves with uniformthereafter. What is the work done by the gravitational force on the drop in the firstand second half of its journey? What is the work done by the resistive force in theentire journey if its speed on reaching the ground is 10 m s?

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