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NEET 2013 · Gravitational Potential & Energy

Gravitational Potential & Energy question from NEET 2013

Q30NEET 2013Easy

Gravitational Potential & Energy

A body of mass 'm' is taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be

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Answer: (d)

  1. ΔU=mgh1+hR\Delta U = \frac{mgh}{1+\frac{h}{R}}
  2. With h=2Rh = 2R: ΔU=2mgR3\Delta U = \frac{2mgR}{3}
  3. So the answer is (d) 23mgR\frac{2}{3}mgR.
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