Gravitational potential at a point is -5 x 10 7 J/kg. Work done to bring 1 kg mass from infinity to this point is:

⚛️ Physics · Gravitation · NEET & JEE

Gravitational potential at a point is -5 x 107 J/kg. Work done to bring 1 kg mass from infinity to this point is:

Answer: -5 x 10 7 J.

A 5 x 107 J
B -5 x 107 J
C Zero
D Infinity

Correct answer: B. -5 x 107 J

Explanation: Work done = m x (Vfinal - Vinfinity) = 1 x (-5 x 107 - 0) = -5 x 107 J. Negative means energy released.

g is maximum at Earth's surface; going up, it falls off as 1/r² (inverse-square); going down, it falls off linearly with depth (since only the mass enclosed within radius r contributes), reaching zero at the centre.

Concept context

Universal gravitation, orbital mechanics, gravitational potential, and escape velocity.

Read the full Gravitation notes →

Gravitational potential at a point is -5 x 10<sup>7</sup> J/kg. Work done to bring 1 kg mass from infinity to this point is:

Concept context

More Gravitation questions