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Physics · PYQ NEET UG 2019(2)
हिन्दीAssuming that the gravitational potential energy of an object at infinity is zero, the change in potential energy (final - initial) of an object of mass \( m \), when taken to a height \( h \) from the surface of earth (of radius \( R \)), is given by,
Correct answer · Option 3
\( \frac{GMmh}{R(R+h)} \)
Explanation
Initial potential energy at surface \( U_i = -\frac{GMm}{R} \). Final potential energy at height \( h \), \( U_f = -\frac{GMm}{R+h} \). Change \( \Delta U = U_f - U_i = -\frac{GMm}{R+h} - (-\frac{GMm}{R}) = \frac{GMmh}{R(R+h)} \).
