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A person brings a mass of 1 kg from infinity to a point A. Initially, the mass was at rest but it movesat a speed of 2 ms-1 as it reached at A. The work done by the person on the mass is - 3 J . Thepotential at A is

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a

-3J kg-1

b

- 12 J kg-1

c

-5 J kg-1

d

None of these

answer is C.

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Detailed Solution

W=EA-E∞=UA+KA-U∞+K∞∴ -3=(1)VA+12×(1)(2)2-(0+0) (∵W=-3 J)∴ VA=-5 J kg-1

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