A person brings a mass of `1 kg` from infinty to a point `A`. Initially, the mass was at rest but it moves at a speed of `3 m//s` as it reaches `A`. The work done by the person on the mass is `- 5.5 J`. The gravitational potential at `A` isA. `- 1 J//kg`B. `- 4.5 J//kg`C. `- 5.5 J//kg`D. `- 10 J//kg`

A person brings a mass of `1 kg` from infinty to a point `A`. Initiall

1.	A person brings a mass of `1 kg` from infinty to a point `A`. Initially, the mass was at rest but it moves at a speed of `3 m//s` as it reaches `A`. The work done by the person on the mass is `- 5.5 J`. The gravitational potential at `A` isA. `- 1 J//kg`B. `- 4.5 J//kg`C. `- 5.5 J//kg`D. `- 10 J//kg`
Answer» Correct Answer - D `W = DeltaE = E_(A) - E_(a)` `= (K_(A) + U_(A)) - (K_(a) + U_(a))` `= (K_(A) + mV_(A)) - (0 + 0)` `:. - 5.5 = (1)/(2) xx 1 xx (3)^(2) + (1) V_(A)`

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