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A person brings a mass of 1 kg from infi...

A person brings a mass of 1 kg from infinity to a point . Initally the mass was at rest but it moves at a speed of 2 `ms^-1` as it reaches A. The work done by the person on the mass is -3J. The potential at A is

A

`-2 J//kg`

B

`-3 J//kg`

C

`-5 J//kg`

D

`-7 J//kg`

Text Solution

Verified by Experts

The correct Answer is:
C
Work done `= P.E. + K.E., - 3 = PE + (1)/(2) xx 1xx 2^(2)`
or `P.E. = - 3 - 2 = - 5J`
ot Gravitational potential
`= P.E.//mass = - 5//1 = - 5J//kg`
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