A person brings a mass of 1 kg from infinity to a point A. Initially, the mass 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 is :
Answer & explanation
Correct answer: option 4
\(\Delta W = \Delta U + \Delta K\)
\(\Rightarrow \Delta U = \Delta W - \Delta K\)
= - 5.5 - \(\frac{1}{2}\) x 1 x 32
= - 10 J
\(\Delta V_g = \frac{\Delta U}{m}\)
= - 10 J/kg