Gravitation Question 113

Question: A body of mass m is taken from earth surface to the height h equal to radius of earth, the increase in potential energy will be [NCERT 1971; CPMT 1971, 97; IIT 1983; CBSE PMT 1991; Kurukshetra CEE 1996;CMEET Bihar 1995; MNR 1998; AIEEE 2004]

Options:

A) mgR

B) $ [\frac{1}{2}mgR] $

C) 2 mgR

D)$ [\frac{1}{4}mgR] $

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Answer:

Correct Answer: B

Solution:

$ [\Delta U=\frac{mgh}{1+\frac{h}{R}}=\frac{1}{2}mgR,,(\because ,,,h=R)] $



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