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Physics · PYQ NEET UG 2019(1)
हिन्दीThe work done to raise a mass \( m \) from the surface of the earth to a height \( h \), which is equal to the radius of the earth, is:
Correct answer · Option 1
\( \frac{1}{2} mgR \)
Explanation
Work done \( W = U_f - U_i = -\frac{GMm}{R+h} - (-\frac{GMm}{R}) \). With \( h=R \), \( W = \frac{GMm}{2R} = \frac{1}{2}mgR \).
