Work Energy And Power Question 321

Question: A person brings a mass of 1 kg from infinity to a point ‘A’. Initially the mass was at rest but it moves at a speed of 2m/s as it reached A. The work done by the person on the mass is -3J. The potential at ‘A’ is:

Options:

A) 3J/kg

B) 2J/kg

C) 5J/kg

D) none of these

Show Answer

Answer:

Correct Answer: C

Solution:

[c] W=(UfUi)+(KfKi)=m(VfVi)+(KfKi) 3=1(VA0)+12×1×(2)20

VA=5J/kg



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